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  • 251.
    Bagheri, Shervin
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
    Mazzino, A.
    Bottaro, A.
    Spontaneous symmetry breaking of a hinged flapping filament generates lift2012In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, no 15, p. 154502-Article in journal (Refereed)
    Abstract [en]

    Elastic filamentous structures found on swimming and flying organisms are versatile in function, rendering their precise contribution to locomotion difficult to assess. We show in this Letter that a single passive filament hinged on the rear of a bluff body placed in a stream can generate a net lift force without increasing the mean drag force on the body. This is a consequence of spontaneous symmetry breaking in the filament's flapping dynamics. The phenomenon is related to a resonance between the frequency associated with the von Kármán vortex street developing behind the bluff body and the natural frequency of the free bending vibrations of the filament.

  • 252.
    Balducci, Federico
    et al.
    Department of Physics and Materials Science, University of Luxembourg, Luxembourg, L-1511, Luxembourg.
    Beau, Mathieu
    Department of Physics, University of Massachusetts, Boston, Massachusetts 02125, USA.
    Yang, Jing
    Nordita SU; Department of Physics and Materials Science, University of Luxembourg, Luxembourg, L-1511, Luxembourg.
    Gambassi, Andrea
    SISSA - International School for Advanced Studies, via Bonomea 265, 34136 Trieste, Italy; INFN, Sezione di Trieste, Trieste, Italy.
    Del Campo, Adolfo
    Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg, Grand Duchy of Luxembourg; Donostia International Physics Center, E-20018 San Sebastián, Spain.
    Large Deviations beyond the Kibble-Zurek Mechanism2023In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 131, no 23, article id 230401Article in journal (Refereed)
    Abstract [en]

    The Kibble-Zurek mechanism (KZM) predicts that the average number of topological defects generated upon crossing a continuous or quantum phase transition obeys a universal scaling law with the quench time. Fluctuations in the defect number near equilibrium are approximately of Gaussian form, in agreement with the central limit theorem. Using large deviations theory, we characterize the universality of fluctuations beyond the KZM and report the exact form of the rate function in the transverse-field quantum Ising model. In addition, we characterize the scaling of large deviations in an arbitrary continuous phase transition, building on recent evidence establishing the universality of the defect number distribution.

  • 253.
    Bandyopadhyay, Sumanta
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Washington Univ, Dept Phys, St Louis, MO 63130 USA.;.;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..
    Ortiz, Gerardo
    Washington Univ, Dept Phys, St Louis, MO 63130 USA.;Indiana Univ, Dept Phys, Bloomington, IN 47405 USA..
    Nussinov, Zohar
    Washington Univ, Dept Phys, St Louis, MO 63130 USA..
    Seidel, Alexander
    Washington Univ, Dept Phys, St Louis, MO 63130 USA..
    Local Two-Body Parent Hamiltonians for the Entire Jain Sequence2020In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 124, no 19, article id 196803Article in journal (Refereed)
    Abstract [en]

    Using an algebra of second-quantized operators, we develop local two-body parent Hamiltonians for all unprojected Jain states at filling factor n/(2np + 1), with integer n and (half-)integer p. We rigorously establish that these states are uniquely stabilized and that zero mode counting reproduces mode counting in the associated edge conformal field theory. We further establish the organizing "entangled Pauli principle" behind the resulting zero mode paradigm and unveil an emergent SU (n) symmetry characteristic of the fixed point physics of the Jain quantum Hall fluid.

  • 254.
    Bao, Fanglin
    et al.
    South China Normal Univ, Ctr Opt & Electromagnet Res, Guangdong Prov Key Lab Opt Informat Mat & Technol, South China Acad Adv Optoelect, Guangzhou 510006, Guangdong, Peoples R China..
    Shi, Kezhang
    Zhejiang Univ, Natl Engn Res Ctr Opt Instrumentat, State Key Lab Modern Opt Instrumentat, Ctr Opt & Electromagnet Res,JORCEP,Coll Opt Sci &, Hangzhou 310058, Zhejiang, Peoples R China..
    Cao, Guanjun
    South China Normal Univ, Ctr Opt & Electromagnet Res, Guangdong Prov Key Lab Opt Informat Mat & Technol, South China Acad Adv Optoelect, Guangzhou 510006, Guangdong, Peoples R China..
    Evans, Julian S.
    Zhejiang Univ, Natl Engn Res Ctr Opt Instrumentat, State Key Lab Modern Opt Instrumentat, Ctr Opt & Electromagnet Res,JORCEP,Coll Opt Sci &, Hangzhou 310058, Zhejiang, Peoples R China..
    He, Sailing
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering. South China Normal Univ, Ctr Opt & Electromagnet Res, Guangdong Prov Key Lab Opt Informat Mat & Technol, South China Acad Adv Optoelect, Guangzhou 510006, Guangdong, Peoples R China.;Zhejiang Univ, Natl Engn Res Ctr Opt Instrumentat, State Key Lab Modern Opt Instrumentat, Ctr Opt & Electromagnet Res,JORCEP,Coll Opt Sci &, Hangzhou 310058, Zhejiang, Peoples R China.
    Inhomogeneity-Induced Casimir Transport of Nanoparticles2018In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 13, article id 130401Article in journal (Refereed)
    Abstract [en]

    We propose a scheme for transporting nanoparticles immersed in a fluid, relying on quantum vacuum fluctuations. The mechanism lies in the inhomogeneity-induced lateral Casimir force between a nanoparticle and a gradient metasurface and the relaxation of the conventional Dzyaloshinskii-Lifshitz-Pitaevskii constraint, which allows quantum levitation for a broader class of material configurations. The velocity for a nanosphere levitated above a grating is calculated and can be up to a few microns per minute. The Born approximation gives general expressions for the Casimir energy which reveal size-selective transport. For any given metasurface, a certain particle-metasurface separation exists where the transport velocity peaks, forming a "Casimir passage." The sign and strength of the Casimir interactions can be tuned by the shapes of liquid-air menisci, potentially allowing real-time control of an otherwise passive force, and enabling interesting on-off or directional switching of the transport process.

  • 255.
    Barkman, Mats
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Benfenati, Andrea
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Samoilenka, Albert
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Babaev, Egor
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Comment on "Surface Pair-Density-Wave Superconducting and Superfluid States" Reply2021In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 126, no 17, article id 179603Article in journal (Other academic)
  • 256.
    Barkman, Mats
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Samoilenka, Albert
    KTH, School of Engineering Sciences (SCI), Physics.
    Babaev, Egor
    KTH, School of Engineering Sciences (SCI), Physics.
    Surface Pair-Density-Wave Superconducting and Superfluid States2019In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 16, article id 165302Article in journal (Refereed)
    Abstract [en]

    Fulde, Ferrell, Larkin, and Ovchinnikov (FFLO) predicted inhomogeneous superconducting and superfluid ground states, spontaneously breaking translation symmetries. In this Letter, we demonstrate that the transition from the FFLO to the normal state as a function of temperature or increased Fermi surface splitting is not a direct one. Instead, the system has an additional phase transition to a different state where pair-density-wave superconductivity (or superfluidity) exists only on the boundaries of the system, while the bulk of the system is normal. The surface pair-density-wave state is very robust and exists for much larger fields and temperatures than the FFLO state.

  • 257. Bartl, A.
    et al.
    Pethick, Christopher J.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Univ Copenhagen, Denmark.
    Schwenk, A.
    Supernova Matter at Subnuclear Densities as a Resonant Fermi Gas: Enhancement of Neutrino Rates2014In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 8, p. 081101-Article in journal (Refereed)
    Abstract [en]

    At low energies nucleon-nucleon interactions are resonant and therefore supernova matter at subnuclear densities has many similarities to atomic gases with interactions dominated by a Feshbach resonance. We calculate the rates of neutrino processes involving nucleon-nucleon collisions and show that these are enhanced in mixtures of neutrons and protons at subnuclear densities due to the large scattering lengths. As a result, the rate for neutrino pair bremsstrahlung and absorption is significantly larger below 10(13) g cm(-3) compared to rates used in supernova simulations.

  • 258.
    Basset, F. Basso
    et al.
    Sapienza Univ Rome, Dept Phys, I-00185 Rome, Italy..
    Rota, M. B.
    Sapienza Univ Rome, Dept Phys, I-00185 Rome, Italy..
    Schimpf, C.
    Johannes Kepler Univ Linz, Inst Semicond & Solid State Phys, A-4040 Linz, Austria..
    Tedeschi, D.
    Sapienza Univ Rome, Dept Phys, I-00185 Rome, Italy..
    Zeuner, Katharina
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    da Silva, S. F. Covre
    Johannes Kepler Univ Linz, Inst Semicond & Solid State Phys, A-4040 Linz, Austria..
    Reindl, M.
    Johannes Kepler Univ Linz, Inst Semicond & Solid State Phys, A-4040 Linz, Austria..
    Zwiller, Val
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Jöns, Klaus D.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Rastelli, A.
    Johannes Kepler Univ Linz, Inst Semicond & Solid State Phys, A-4040 Linz, Austria..
    Trotta, R.
    Sapienza Univ Rome, Dept Phys, I-00185 Rome, Italy..
    Entanglement Swapping with Photons Generated on Demand by a Quantum Dot2019In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, no 16, article id 160501Article in journal (Refereed)
    Abstract [en]

    Photonic entanglement swapping, the procedure of entangling photons without any direct interaction, is a fundamental test of quantum mechanics and an essential resource to the realization of quantum networks. Probabilistic sources of nonclassical light were used for seminal demonstration of entanglement swapping, but applications in quantum technologies demand push-button operation requiring single quantum emitters. This, however, turned out to be an extraordinary challenge due to the stringent prerequisites on the efficiency and purity of the generation of entangled states. Here we show a proof-of-concept demonstration of all-photonic entanglement swapping with pairs of polarization-entangled photons generated on demand by a GaAs quantum dot without spectral and temporal filtering. Moreover, we develop a theoretical model that quantitatively reproduces the experimental data and provides insights on the critical figures of merit for the performance of the swapping operation. Our theoretical analysis also indicates how to improve stateof-the-art entangled-photon sources to meet the requirements needed for implementation of quantum dots in long-distance quantum communication protocols.

  • 259.
    Basso, Benjamin
    et al.
    Univ Paris Cite, Univ PSL, Sorbonne Univ, Lab Phys Ecole Normale Super,ENS, F-75005 Paris, France..
    Georgoudis, Alessandro
    Nordita SU;Stockholm Univ Hannes Alfvensvag 12, S-10691 Stockholm, Sweden..
    Sueiro, Arthur Klemenchuk
    Univ Paris Cite, Univ PSL, Sorbonne Univ, Lab Phys Ecole Normale Super,ENS, F-75005 Paris, France..
    Structure Constants of Short Operators in Planar N=4 Supersymmetric Yang-Mills Theory2023In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 130, no 13, article id 131603Article in journal (Refereed)
    Abstract [en]

    We present a conjecture for the three-point functions of single-trace operators in planar N = 4 super -Yang-Mills theory at finite coupling, in the case where two operators are protected. Our proposal is based on the hexagon representation for structure constants of long operators, which we complete to incorporate operators of any length using data from the TBA-QSC formalism. We perform various tests of our conjecture, at weak and strong coupling, finding agreement with the gauge theory through 5 loops for the shortest three-point function and with string theory in the classical limit.

  • 260.
    Baykov, Vitaly
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Korzhavyi, Pavel A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Johansson, Börje
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Diffusion of Interstitial Mn in the Dilute Magnetic Semiconductor (Ga,Mn)As: The Effect of a Charge State2008In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, no 17, p. 177204-Article in journal (Refereed)
    Abstract [en]

    Migration barriers for diffusion of interstitial Mn in the dilute magnetic semiconductor (Ga,Mn)As are studied using first-principles calculations. The diffusion pathway goes through two types of interstitial sites: As coordinated and Ga coordinated. The energy profile along the path is found to depend on the ratio of concentrations between substitutional and interstitial Mn in GaAs. Two regions of distinctly different behavior, corresponding to n-type and p-type (Ga,Mn)As, are identified. The difference in mobility is a reflection of the change in the charge state of Mn interstitials (double donors) that occurs in the presence of substitutional Mn impurities (acceptors). In addition, substitutional Mn impurities are shown to act as traps for interstitial Mn. The effective migration barrier for the positively doubly charged Mn interstitials in p-type (Ga,Mn)As is estimated to vary from 0.55 to about 0.95 eV.

  • 261.
    Beaulieu, S.
    et al.
    Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-14195 Berlin, Germany..
    Schusser, J.
    CY Cergy Paris Univ, Lab Phys Mat & Surfaces, F-95031 Cergy Pontoise, France.;Univ West Bohemia, New Technol Res Ctr, Plzen 30614, Czech Republic..
    Dong, S.
    Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-14195 Berlin, Germany..
    Schuler, M.
    Stanford Inst Mat & Energy Sci SIMES, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA..
    Pincelli, T.
    Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-14195 Berlin, Germany..
    Dendzik, Maciej
    KTH, School of Engineering Sciences (SCI), Applied Physics. Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-14195 Berlin, Germany..
    Maklar, J.
    Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-14195 Berlin, Germany..
    Neef, A.
    Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-14195 Berlin, Germany..
    Ebert, H.
    Ludwig Maximilians Univ Munchen, Dept Chem, Butenandtstr 11, D-81377 Munich, Germany..
    Hricovini, K.
    CY Cergy Paris Univ, Lab Phys Mat & Surfaces, F-95031 Cergy Pontoise, France.;Univ Paris Saclay, CEA Saclay, CNRS, LIDYL,CEA, F-91191 Gif Sur Yvette, France..
    Wolf, M.
    Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-14195 Berlin, Germany..
    Braun, J.
    Ludwig Maximilians Univ Munchen, Dept Chem, Butenandtstr 11, D-81377 Munich, Germany..
    Rettig, L.
    Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-14195 Berlin, Germany..
    Minar, J.
    Univ West Bohemia, New Technol Res Ctr, Plzen 30614, Czech Republic..
    Ernstorfer, R.
    Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-14195 Berlin, Germany..
    Revealing Hidden Orbital Pseudospin Texture with Time-Reversal Dichroism in Photoelectron Angular Distributions2020In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 125, no 21, article id 216404Article in journal (Refereed)
    Abstract [en]

    We performed angle-resolved photoemission spectroscopy (ARPES) of bulk 2H-WSe2 for different crystal orientations linked to each other by time-reversal symmetry. We introduce a new observable called time-reversal dichroism in photoelectron angular distributions (TRDAD), which quantifies the modulation of the photoemission intensity upon effective time-reversal operation. We demonstrate that the hidden orbital pseudospin texture leaves its imprint on TRDAD, due to multiple orbital interference effects in photoemission. Our experimental results are in quantitative agreement with both the tight-binding model and state-of-the-art fully relativistic calculations performed using the one-step model of photoemission. While spin-resolved ARPES probes the spin component of entangled spin-orbital texture in multiorbital systems, we unambiguously demonstrate that TRDAD reveals its orbital pseudospin texture counterpart.

  • 262. Belonoshko, Anatoly B.
    et al.
    Ahuja, R.
    Johansson, Börje
    Quasi - Ab initio molecular dynamic study of Fe melting2000In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 84, no 16, p. 3638-3641Article in journal (Refereed)
    Abstract [en]

    We have investigated the melting of hcp Fe at high pressure by employing molecular dynamics simulations in conjunction with the full potential linear muffin tin orbital method. Apart from being of fundamental value. the melting of iron at high pressure is also important for our understanding of the Earth. The subject of iron melting at high pressures is controversial. The experimental data for the iron melting temperature can be separated into two regions. low and high. Here we present an ab initio simulated iron melting curve which is in agreement with the low temperatures at lower pressures, but is in excellent agreement with the high-mostly shockwave-temperatures at high pressure. A comparison with available data lends support to the presented iron melting curve.

  • 263.
    Belonoshko, Anatoly B.
    et al.
    KTH, Superseded Departments (pre-2005), Physics.
    Ahuja, Rajeev
    Johansson, Börje
    KTH, Superseded Departments (pre-2005), Materials Science and Engineering.
    Molecular dynamics study of melting and fcc-bcc transitions in Xe2001In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 8716, no 16, p. art. no.-165505Article in journal (Refereed)
    Abstract [en]

    We have investigated the phase diagram of Xe over a wide pressure-temperature range by molecular dynamics. The calculated melting curve is in good agreement with earlier experimental data. At a pressure of around 25 GPa and a temperature of about 2700 K we find a triple fcc-bcc liquid point. The calculated fcc-bcc boundary is in nice agreement with the experimental points, which, however, were interpreted as melting. This finding suggests that the transition from close-packed to bcc structure might be more common at high pressure and high temperature than was previously anticipated.

  • 264.
    Belonoshko, Anatoly B.
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Bryk, T.
    Rosengren, Anders
    Shear Relaxation in Iron under the Conditions of Earth's Inner Core2010In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 104, no 24, p. 245703-Article in journal (Refereed)
    Abstract [en]

    Large scale molecular dynamics simulations of iron at high pressure and temperature are performed to investigate the physics of shear softening. A solid 16 x 10(6) atoms sample of iron is grown out of the liquid with a small solid immersed in it at the start of simulation. We observe that diffusion in the sheared solid is similar to that in liquid, even though at different time scales. This allows us to describe the time dependence of shear stress in terms of elastic and hydrodynamic relaxation. The elastic response of the sample is close to the elastic response of Earth's inner core. This explains the abnormally low shear modulus in the core. The reason for the low shear modulus is the presence of defects of the crystal structure.

  • 265.
    Belonoshko, Anatoly B.
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Burakovsky, L.
    Chen, S. P.
    Johansson, Börje
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Mikhaylushkin, A. S.
    Preston, D. L.
    Simak, S. I.
    Swift, D. C.
    Molybdenum at high pressure and temperature: Melting from another solid phase2008In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 100, no 13Article in journal (Refereed)
    Abstract [en]

    The Gibbs free energies of bcc and fcc Mo are calculated from first principles in the quasiharmonic approximation in the pressure range from 350 to 850 GPa at room temperatures up to 7500 K. It is found that Mo, stable in the bcc phase at low temperatures, has lower free energy in the fcc structure than in the bcc phase at elevated temperatures. Our density-functional-theory-based molecular dynamics simulations demonstrate that fcc melts at higher than bcc temperatures above 1.5 Mbar. Our calculated melting temperatures and bcc-fcc boundary are consistent with the Mo Hugoniot sound speed measurements. We find that melting occurs at temperatures significantly above the bcc-fcc boundary. This suggests an explanation of the recent diamond anvil cell experiments, which find a phase boundary in the vicinity of our extrapolated bcc-fcc boundary.

  • 266.
    Belonoshko, Anatoly B.
    et al.
    KTH, Superseded Departments (pre-2005), Physics.
    Simak, S. I.
    Kochetov, A. E.
    Johansson, Börje
    KTH, Superseded Departments (pre-2005), Materials Science and Engineering.
    Burakovsky, L.
    Preston, D. L.
    High-pressure melting of molybdenum2004In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 92, no 19Article in journal (Refereed)
    Abstract [en]

    The melting curve of the body-centered cubic (bcc) phase of Mo has been determined for a wide pressure range using both direct ab initio molecular dynamics simulations of melting as well as a phenomenological theory of melting. These two methods show very good agreement. The simulations are based on density functional theory within the generalized gradient approximation. Our calculated equation of state of bcc Mo is in excellent agreement with experimental data. However, our melting curve is substantially higher than the one determined in diamond anvil cell experiments up to a pressure of 100 GPa. An explanation is suggested for this discrepancy.

  • 267.
    Belonoshko, Anatoly B.
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Skorodumova, N. V.
    Rosengren, Anders
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Ahuja, Rajeev
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Johansson, Börje
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Burakovsky, L.
    Preston, D. L.
    High-pressure melting of MgSiO32005In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 94, no 19Article in journal (Refereed)
    Abstract [en]

    The melting curve of MgSiO3 perovskite has been determined by means of ab initio molecular dynamics complemented by effective pair potentials, and a new phenomenological model of melting. Using first principles ground state calculations, we find that the MgSiO3 perovskite phase transforms into post perovskite at pressures above 100 GPa, in agreement with recent theoretical and experimental studies. We find that the melting curve of MgSiO3, being very steep at pressures below 60 GPa, rapidly flattens on increasing pressure. The experimental controversy on the melting of the MgSiO3 perovskite at high pressures is resolved, confirming the data by Zerr and Boehler.

  • 268.
    Bergkvist, Sara
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Saers, Robert
    Umeå Univ, Dept Phys.
    Lundh, Emil
    Umeå Univ, Dept Phys.
    Rosengren, Anders
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Rehn, Magnus
    Umeå Univ, Dept Phys.
    Kastberg, Anders
    Umeå Univ, Dept Phys.
    Transition from a two-dimensional superfluid to a one-dimensional mott insulator2007In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 99, no 11, p. 110401-1-110401-5Article in journal (Refereed)
    Abstract [en]

    A two-dimensional system of atoms in an anisotropic optical lattice is studied theoretically. If the system is finite in one direction, it is shown to exhibit a transition between a two-dimensional superfluid and a one-dimensional Mott insulating chain of superfluid tubes. Monte Carlo simulations are consistent with the expectation that the phase transition is of Kosterlitz-Thouless type. The effect of the transition on experimental time-of-flight images is discussed.

  • 269.
    Bergqvist, Lars
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Eriksson, O
    Kudrnovsky, J
    Drchal, V
    Korzhavyi, Pavel
    KTH, Superseded Departments (pre-2005), Materials Science and Engineering.
    Turek, I
    Magnetic percolation in diluted magnetic semiconductors2004In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 93, no 13, p. 137202-Article in journal (Refereed)
    Abstract [en]

    We demonstrate that the magnetic properties of diluted magnetic semiconductors are dominated by short ranged interatomic exchange interactions that have a strong directional dependence. By combining first principles calculations of interatomic exchange interactions with a classical Heisenberg model and Monte Carlo simulations, we reproduce the observed critical temperatures of a broad range of diluted magnetic semiconductors. We also show that agreement between theory and experiment is obtained only when the magnetic atoms are randomly positioned. This suggests that the ordering of diluted magnetic semiconductors is heavily influenced by magnetic percolation, and that the measured critical temperatures should be very sensitive to details in the sample preparation, in agreement with observations.

  • 270. Bern, Z.
    et al.
    Carrasco, J. J.
    Chen, W. -M
    Johansson, Henrik
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Uppsala University, Sweden.
    Roiban, R.
    Gravity Amplitudes as Generalized Double Copies of Gauge-Theory Amplitudes2017In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 118, no 18, article id 181602Article in journal (Refereed)
    Abstract [en]

    Whenever the integrand of a gauge-theory loop amplitude can be arranged into a form where the Bern-Carrasco-Johansson duality between color and kinematics is manifest, a corresponding gravity integrand can be obtained simply via the double-copy procedure. However, finding such gauge-theory representations can be challenging, especially at high loop orders. Here, we show that we can, instead, start from generic gauge-theory integrands, where the duality is not manifest, and apply a modified double-copy procedure to obtain gravity integrands that include contact terms generated by violations of dual Jacobi identities. We illustrate this with three-, four- and five-loop examples in N=8 supergravity.

  • 271.
    Berrier, Audrey
    et al.
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Mulot, Mikaël
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Swillo, Marcin
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Qiu, Min
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Thylén, Lars
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Talneau, A.
    CNRS, Lab Photon & Nanostruct.
    Anand, Srinivasan
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Negative Refraction at Infrared Wavelengths in a Two-Dimensional Photonic Crystal2004In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 93, no 073902Article in journal (Refereed)
    Abstract [en]

    We report on the first experimental evidence of negative refraction at telecommunication wavelengths by a two-dimensional photonic crystal field. Samples were fabricated by chemically assisted ion beam etching in the InP-based low-index constrast system. Experiments of beam imaging and light collection show light focusing by the photonic crystal field. Finite-difference time-domain simulations confirm that the observed focusing is due to negative refraction in the photonic crystal area.

  • 272. Biemont, E
    et al.
    Derkatch, A
    Lundin, P
    Mannervik, S
    Norlin, Lars-Olov
    KTH, Superseded Departments (pre-2005), Physics.
    Rostohar, D
    Royen, P
    Palmeri, P
    Schef, P
    Importance of an M2 depopulating channel for a KrII metastable state2004In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 93, no 6, p. 063003-Article in journal (Refereed)
    Abstract [en]

    An experimental investigation of the radiative lifetime of the metastable 4s(2)4p(4)(P-3)4d D-4(7/2) level in Kr II shows an unusual situation regarding the importance of an M2 depopulation channel. While the first order M1 and E2 channels are expected to contribute in a dominant way to the decay, the experimental result, obtained using a laser probing technique on a stored ion beam, tau=0.57+/-0.03 s, is far too short to be due to these channels according to our relativistic multiconfiguration Dirac-Fock calculation. Only if second order contributions to the decay branches (including essentially the M2 contribution) are taken into account in the calculations could the unexpected short lifetime be explained.

  • 273. Bjorneholm, O.
    et al.
    Bassler, M.
    Ausmees, A.
    Hjelte, I.
    Feifel, R.
    Wang, H.
    Miron, C.
    Piancastelli, M. N.
    Svensson, S.
    Sorensen, S. L.
    Gel'mukhanov, Faris
    KTH, Superseded Departments (pre-2005), Biotechnology.
    Ågren, Hans
    KTH, Superseded Departments (pre-2005), Biotechnology.
    Doppler splitting of in-flight auger decay of dissociating oxygen molecules: The localization of delocalized core holes2000In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 84, no 13, p. 2826-2829Article in journal (Refereed)
    Abstract [en]

    By exploiting the core-excitation-induced dissociation of O-2, we find that the Auger emission exhibits a Doppler-like energy shift. We show this to be a manifestation of localization of the core hole and propose that the problem of core-hole localization versus delocalization in core-hole spectroscopies may be resolved by considering the nature of the measurement.

  • 274.
    Björk, Gunnar
    et al.
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Sanchez-Soto, L. L.
    Soderholm, J.
    Entangled-state lithography: Tailoring any pattern with a single state2001In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 86, no 20, p. 4516-4519Article in journal (Refereed)
    Abstract [en]

    We demonstrate a systematic approach to Heisenberg-Limited lithographic image formation using four-mode reciprocal binomial states. By controlling the exposure pattern with a simple bank of birefringent plates, any pixel pattern on a (N + 1) X (N + 1) grid, occupying a square with the side half a wavelength long, can be generated from a 2N-photon state.

  • 275.
    Blomquist, Emil
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Syrwid, Andrzej
    KTH, School of Engineering Sciences (SCI), Physics.
    Babaev, Egor
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Borromean Supercounterfluidity2021In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 127, no 25, article id 255303Article in journal (Refereed)
    Abstract [en]

    We demonstrate microscopically the existence of a new superfluid state of matter in a three-component Bose mixture trapped in an optical lattice. The superfluid transport involving coflow of all three components is arrested in that state, while counterflows between any pair of components are dissipationless. The presence of three components allows for three different types of counterflows with only two independent superfluid degrees of freedom.

  • 276.
    Bo, Stefano
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..
    Eichhorn, Ralf
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Driven Anisotropic Diffusion at Boundaries: Noise Rectification and Particle Sorting2017In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 6, article id 060603Article in journal (Refereed)
    Abstract [en]

    We study the diffusive dynamics of a Brownian particle in the proximity of a flat surface under nonequilibrium conditions, which are created by an anisotropic thermal environment with different temperatures being active along distinct spatial directions. By presenting the exact time-dependent solution of the Fokker-Planck equation for this problem, we demonstrate that the interplay between anisotropic diffusion and hard-core interaction with the plain wall rectifies the thermal fluctuations and induces directed particle transport parallel to the surface, without any deterministic forces being applied in that direction. Based on current micromanipulation technologies, we suggest a concrete experimental setup to observe this novel noise-induced transport mechanism. We furthermore show that it is sensitive to particle characteristics, such that this setup can be used for sorting particles of different sizes.

  • 277. Bogunovic, L.
    et al.
    Fliedner, M.
    Eichhorn, Ralf
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Wegener, S.
    Regtmeier, J.
    Anselmetti, D.
    Reimann, P.
    Chiral particle separation by a nonchiral microlattice2012In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, no 10, p. 100603-Article in journal (Refereed)
    Abstract [en]

    We conceived a model experiment for a continuous separation strategy of chiral molecules (enantiomers) without the need of any chiral selector structure or derivatization agents: Microparticles that only differ by their chirality are shown to migrate along different directions when driven by a steady fluid flow through a square lattice of cylindrical posts. In accordance with our numerical predictions, the transport directions of the enantiomers depend very sensitively on the orientation of the lattice relative to the fluid flow.

  • 278.
    Bommer, Jouri D. S.
    et al.
    Delft Univ Technol, QuTech, NL-2600 GA Delft, Netherlands.;Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands..
    Zhang, Hao
    Delft Univ Technol, QuTech, NL-2600 GA Delft, Netherlands.;Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands.;Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Dept Phys, Beijing 100084, Peoples R China..
    Gul, Onder
    Delft Univ Technol, QuTech, NL-2600 GA Delft, Netherlands.;Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands..
    Nijholt, Bas
    Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands..
    Wimmer, Michael
    Delft Univ Technol, QuTech, NL-2600 GA Delft, Netherlands.;Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands..
    Rybakov, Filipp N.
    KTH, School of Engineering Sciences (SCI), Physics, Statistical Physics. KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Garaud, Julien
    Univ Tours, Lab Math & Phys Theor CNRS UMR 7350, Inst Denis Poisson FR2964, Parc Grandmt, F-37200 Tours, France..
    Rodic, Donjan
    Swiss Fed Inst Technol, Inst Theoret Phys, CH-8093 Zurich, Switzerland..
    Babaev, Egor
    KTH, School of Engineering Sciences (SCI), Physics, Statistical Physics.
    Troyer, Matthias
    Swiss Fed Inst Technol, Inst Theoret Phys, CH-8093 Zurich, Switzerland.;Microsoft Quantum, Redmond, WA 98052 USA..
    Car, Diana
    Eindhoven Univ Technol, Dept Appl Phys, NL-5600 MB Eindhoven, Netherlands..
    Plissard, Sebastien R.
    Eindhoven Univ Technol, Dept Appl Phys, NL-5600 MB Eindhoven, Netherlands..
    Bakkers, Erik P. A. M.
    Delft Univ Technol, QuTech, NL-2600 GA Delft, Netherlands.;Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands.;Eindhoven Univ Technol, Dept Appl Phys, NL-5600 MB Eindhoven, Netherlands..
    Watanabe, Kenji
    Natl Inst Mat Sci, Adv Mat Lab, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan..
    Taniguchi, Takashi
    Natl Inst Mat Sci, Adv Mat Lab, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan..
    Kouwenhoven, Leo P.
    Delft Univ Technol, QuTech, NL-2600 GA Delft, Netherlands.;Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands.;Microsoft Stn Q Delft, NL-2600 GA Delft, Netherlands..
    Spin-Orbit Protection of Induced Superconductivity in Majorana Nanowires2019In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 18, article id 187702Article in journal (Refereed)
    Abstract [en]

    Spin-orbit interaction (SOI) plays a key role in creating Majorana zero modes in semiconductor nanowires proximity coupled to a superconductor. We track the evolution of the induced superconducting gap in InSb nanowires coupled to a NbTiN superconductor in a large range of magnetic field strengths and orientations. Based on realistic simulations of our devices, we reveal SOI with a strength of 0.15-0.35 eV angstrom. Our approach identifies the direction of the spin-orbit field, which is strongly affected by the superconductor geometry and electrostatic gates.

  • 279.
    Bonetti, Stefano
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    Tiberkevich, Vasil
    Consolo, Giancarlo
    Finocchio, Giovanni
    Muduli, Pranaba
    Mancoff, Fred
    Åkerman, Johan
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    Experimental evidence of self-localized and propagating spin wave modes in obliquely magnetized current-driven magnetic nanocontacts2010In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, no 21, p. 217204-Article in journal (Refereed)
    Abstract [en]

    Through detailed experimental studies of the angular dependence of spin wave excitations in nanocontact-based spin-torque oscillators, we demonstrate that two distinct spin wave modes can be excited, with different frequency, threshold currents, and frequency tunability. Using analytical theory and micromagnetic simulations we identify one mode as an exchange-dominated propagating spin wave, and the other as a self-localized nonlinear spin wave bullet. Wavelet-based analysis of the simulations indicates that the apparent simultaneous excitation of both modes results from rapid mode hopping induced by the Oersted field.

  • 280.
    Borlenghi, Simone
    et al.
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
    Wang, Weiwei
    Fangohr, Hans
    Bergqvist, Lars
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. KTH, Centres, SeRC - Swedish e-Science Research Centre.
    Delin, Anna
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. KTH, Centres, SeRC - Swedish e-Science Research Centre.
    Designing a Spin-Seebeck Diode2014In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, no 4, p. 047203-Article in journal (Refereed)
    Abstract [en]

    Using micromagnetic simulations, we have investigated spin dynamics in a spin-valve bilayer in the presence of a thermal gradient. The direction and the intensity of the gradient allow us to excite the spin wave modes of each layer selectively. This permits us to synchronize the magnetization precession of the two layers and to rectify the flows of energy and magnetization through the system. Our study yields promising opportunities for applications in spin caloritronics and nanophononics devices.

  • 281. Boso, A.
    et al.
    Lenzi, S. M.
    Recchia, F.
    Bonnard, J.
    Zuker, A. P.
    Aydin, S.
    Bentley, M. A.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Clement, E.
    de France, G.
    Di Nitto, A.
    Dijon, A.
    Doncel, M.
    Ghazi-Moradi, F.
    Gadea, A.
    Gottardo, A.
    Henry, T.
    Huyuk, T.
    Jaworski, G.
    John, P. R.
    Juhasz, K.
    Kuti, I
    Melon, B.
    Mengoni, D.
    Michelagnoli, C.
    Modamio, V
    Napoli, D. R.
    Nyako, B. M.
    Nyberg, J.
    Palacz, M.
    Timar, J.
    Valiente-Dobon, J. J.
    Neutron Skin Effects in Mirror Energy Differences: The Case of Mg-23-Na-232018In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 3, article id 032502Article in journal (Refereed)
    Abstract [en]

    Energy differences between analogue states in the T = 1/2 Mg-23-Na-23 mirror nuclei have been measured along the rotational yrast bands. This allows us to search for effects arising from isospin-symmetrybreaking interactions (ISB) and/or shape changes. Data are interpreted in the shell model framework following the method successfully applied to nuclei in the f(7/2) shell. It is shown that the introduction of a schematic ISB interaction of the same type of that used in the f(7/2) shell is needed to reproduce the data. An alternative novel description, applied here for the first time, relies on the use of an effective interaction deduced from a realistic charge-dependent chiral nucleon-nucleon potential. This analysis provides two important results: (i) The mirror energy differences give direct insight into the nuclear skin; (ii) the skin changes along the rotational bands are strongly correlated with the difference between the neutron and proton occupations of the s(1/2) "halo" orbit.

  • 282.
    Brandenburg, Axel
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Kahniashvili, Tina
    Classes of Hydrodynamic and Magnetohydrodynamic Turbulent Decay2017In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 118, no 5, article id 055102Article in journal (Refereed)
    Abstract [en]

    We perform numerical simulations of decaying hydrodynamic and magnetohydrodynamic turbulence. We classify our time-dependent solutions by their evolutionary tracks in parametric plots between instantaneous scaling exponents. We find distinct classes of solutions evolving along specific trajectories toward points on a line of self-similar solutions. These trajectories are determined by the underlying physics governing individual cases, while the infrared slope of the initial conditions plays only a limited role. In the helical case, even for a scale-invariant initial spectrum (inversely proportional to wave number k), the solution evolves along the same trajectory as for a Batchelor spectrum (proportional to k(4)).

  • 283.
    Brandenburg, Axel
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.
    Kahniashvili, Tina
    Tevzadze, Alexander G.
    Nonhelical Inverse Transfer of a Decaying Turbulent Magnetic Field2015In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 114, no 7, article id 075001Article in journal (Refereed)
    Abstract [en]

    In the presence of magnetic helicity, inverse transfer from small to large scales is well known in magnetohydrodynamic (MHD) turbulence and has applications in astrophysics, cosmology, and fusion plasmas. Using high resolution direct numerical simulations of magnetically dominated self-similarly decaying MHD turbulence, we report a similar inverse transfer even in the absence of magnetic helicity. We compute for the first time spectral energy transfer rates to show that this inverse transfer is about half as strong as with helicity, but in both cases the magnetic gain at large scales results from velocity at similar scales interacting with smaller-scale magnetic fields. This suggests that both inverse transfers are a consequence of universal mechanisms for magnetically dominated turbulence. Possible explanations include inverse cascading of the mean squared vector potential associated with local near two dimensionality and the shallower k(2) subinertial range spectrum of kinetic energy forcing the magnetic field with a k(4) subinertial range to attain larger-scale coherence. The inertial range shows a clear k(-2) spectrum and is the first example of fully isotropic magnetically dominated MHD turbulence exhibiting weak turbulence scaling.

  • 284.
    Brandhuber, Andreas
    et al.
    Queen Mary Univ London, Ctr Theoret Phys, Dept Phys & Astron, Mile End Rd, London E1 4NS, England..
    Chen, Gang
    Queen Mary Univ London, Ctr Theoret Phys, Dept Phys & Astron, Mile End Rd, London E1 4NS, England..
    Johansson, Henrik
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.). Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden.;Stockholm Univ, NORDITA, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden..
    Travaglini, Gabriele
    Queen Mary Univ London, Ctr Theoret Phys, Dept Phys & Astron, Mile End Rd, London E1 4NS, England..
    Wen, Congkao
    Queen Mary Univ London, Ctr Theoret Phys, Dept Phys & Astron, Mile End Rd, London E1 4NS, England..
    Kinematic Hopf Algebra for Bern-Carrasco-Johansson Numerators in Heavy-Mass Effective Field Theory and Yang-Mills Theory2022In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 128, no 12, article id 121601Article in journal (Refereed)
    Abstract [en]

    We present a closed formula for all Bern-Carrasco-Johansson (BCJ) numerators describing D-dimensional tree-level scattering amplitudes in a heavy-mass effective field theory with two massive particles and an arbitrary number of gluons. The corresponding gravitational amplitudes obtained via the double copy directly enter the computation of black-hole scattering and gravitational-wave emission. Our construction is based on finding a kinematic algebra for the numerators, which we relate to a quasishuffle Hopf algebra. The BCJ numerators thus obtained have a compact form and intriguing features: gauge invariance is manifest, locality is respected for massless exchange, and they contain poles corresponding to massive exchange. Counting the number of terms in a BCJ numerator for n - 2 gluons gives the Fubini numbers Fn-3, reflecting the underlying quasishuffle Hopf algebra structure. Finally, by considering an appropriate factorization limit, the massive particles decouple, and we thus obtain a kinematic algebra and all tree-level BCJ numerators for D-dimensional pure Yang-Mills theory.

  • 285.
    Brena, Barbara
    et al.
    KTH, School of Biotechnology (BIO), Theoretical Chemistry.
    Nordlund, D
    Odelius, M
    Ogasawara, H
    Nilsson, A
    Pettersson, L G M
    Ultrafast molecular dissociation of water in ice2004In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 93, no 14, p. 148302-Article in journal (Refereed)
    Abstract [en]

    Using x-ray emission and photoemission spectroscopies to measure the occupied valence levels in a thin crystalline ice film, we resolve the ionization-induced dissociation of water in ice on a femtosecond time scale. Isotope substitution confirms proton transfer during the core-hole lifetime in spite of the nonresonant excitation. Through ab initio molecular dynamics on the core-ionized state, the dissociation and spectrum evolution are followed at femtosecond intervals. The theoretical simulations confirm the experimental analysis and allow for a detailed study of the dissociative reaction path.

  • 286.
    Brenning, Nils
    et al.
    KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    Merlino, R. L.
    Lundin, D.
    Raadu, Michael A.
    KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    Helmersson, U.
    Faster-than-Bohm Cross-B Electron Transport in Strongly Pulsed Plasmas2009In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 103, no 22Article in journal (Refereed)
    Abstract [en]

    We report the empirical discovery of an exceptionally high cross-B electron transport rate in magnetized plasmas, in which transverse currents are driven with abruptly applied high power. Experiments in three different magnetic geometries are analyzed, covering several orders of magnitude in plasma density, magnetic field strength, and ion mass. It is demonstrated that a suitable normalization parameter is the dimensionless product of the electron (angular) gyrofrequency and the effective electron-ion momentum transfer time, omega(ge)tau(EFF), by which all of diffusion, cross-resistivity, cross-B current conduction, and magnetic field diffusion can be expressed. The experiments show a remarkable consistency and yield close to a factor of 5 greater than the Bohm-equivalent values of diffusion coefficient D-perpendicular to, magnetic-diffusion coefficient D-B, Pedersen conductivity sigma(P), and transverse resistivity eta(perpendicular to).

  • 287.
    Brethouwer, Geert
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Turbulence. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.
    Schlatter, Philipp
    KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.
    Duguet, Yohann
    Henningson, Dan S.
    KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.
    Johansson, Arne V.
    KTH, School of Engineering Sciences (SCI), Mechanics, Turbulence. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.
    Recurrent Bursts via Linear Processes in Turbulent Environments2014In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, no 14, p. 144502-Article in journal (Refereed)
    Abstract [en]

    Large-scale instabilities occurring in the presence of small-scale turbulent fluctuations are frequently observed in geophysical or astrophysical contexts but are difficult to reproduce in the laboratory. Using extensive numerical simulations, we report here on intense recurrent bursts of turbulence in plane Poiseuille flow rotating about a spanwise axis. A simple model based on the linear instability of the mean flow can predict the structure and time scale of the nearly periodic and self-sustained burst cycles. Poiseuille flow is suggested as a prototype for future studies of low-dimensional dynamics embedded in strongly turbulent environments.

  • 288.
    Brethouwer, Gert
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Engineering Mechanics.
    Comment on "Turbulence Statistics of Arbitrary Moments of Wall-Bounded Shear Flows: A Symmetry Approach"2023In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 130, no 6, article id 069401Article in journal (Other academic)
  • 289. Brookes, N. B.
    et al.
    Ghiringhelli, G.
    Tjernberg, Oscar
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Tjeng, L. H.
    Mizokawa, T.
    Li, T. W.
    Menovsky, A. A.
    Detection of Zhang-Rice singlets using spin-polarized photoemission2001In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 8723, no 23Article in journal (Refereed)
    Abstract [en]

    From a spin-resolved photoemission study on the Bi2Sr2CaCu2O8+delta superconductor, we show experimentally that the first ionization state is of nearly pure singlet character. This is true both above and below the superconducting transition and in the presence of doping and band formation. This provides direct support for the existence and stability of Zhang-Rice singlets in high-temperature superconductors, justifying the ansatz of single-band models. Moreover, we establish this technique as an important probe for a wide range of cuprates and strongly correlated materials.

  • 290.
    Browne, F.
    et al.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Chen, S.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong 999077, Peoples R China.;Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China..
    Doornenbal, P.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Obertelli, A.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany.;Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Ogata, K.
    Osaka Univ, Res Ctr Nucl Phys RCNP, Ibaraki 5670047, Japan.;Osaka City Univ, Dept Phys, Osaka 5588585, Japan..
    Utsuno, Y.
    Univ Tokyo, Ctr Nucl Study, RIKEN Campus, Wako, Saitama 3510198, Japan.;Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan..
    Yoshida, K.
    Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan..
    Achouri, N. L.
    Univ Caen, ENSICAEN, LPC Caen, CNRS IN2P3, F-14050 Caen, France..
    Baba, H.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Calvet, D.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Chateau, F.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Chiga, N.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Corsi, A.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Cortes, M. L.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Delbart, A.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Gheller, J-M
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Giganon, A.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Gillibert, A.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Hilaire, C.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Isobe, T.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Kobayashi, T.
    Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan..
    Kubota, Y.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Univ Tokyo, Ctr Nucl Study, RIKEN Campus, Wako, Saitama 3510198, Japan..
    Lapoux, V
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Liu, H. N.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.;KTH Royal Inst Technol, S-10691 Stockholm, Sweden..
    Motobayashi, T.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Murray, I
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;CNRS, IPN Orsay, F-91406 Orsay, France.;Univ Paris Saclay, F-91406 Orsay, France..
    Otsu, H.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Panin, V
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Paul, N.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Rodriguez, W.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Univ Nacl Colombia, Fac Ciencias, Dept Fis, Sede Bogota, Bogota 111321, Colombia.;Pontificia Univ Javeriana, Fac Ciencias, Dept Fis, Bogota, Colombia..
    Sakurai, H.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan..
    Sasano, M.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Steppenbeck, D.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Stuhl, L.
    Univ Tokyo, Ctr Nucl Study, RIKEN Campus, Wako, Saitama 3510198, Japan.;Inst for Basic Sci Korea, Daejeon 34126, South Korea..
    Sun, Y. L.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France..
    Togano, Y.
    Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan..
    Uesaka, T.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Wimmer, K.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan.;CSIC, Inst Estruct Mat, E-28006 Madrid, Spain..
    Yoneda, K.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Aktas, Özge
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. KTH Royal Inst Technol, S-10691 Stockholm, Sweden..
    Aumann, T.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany.;GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany..
    Boretzky, K.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany..
    Caesar, C.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany.;GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany..
    Chung, L. X.
    VINATOM, Inst Nucl Sci & Technol, POB 5T-160, Hanoi, Vietnam..
    Flavigny, F.
    CNRS, IPN Orsay, F-91406 Orsay, France.;Univ Paris Saclay, F-91406 Orsay, France..
    Franchoo, S.
    CNRS, IPN Orsay, F-91406 Orsay, France.;Univ Paris Saclay, F-91406 Orsay, France..
    Gasparic, I
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany.;Rudjer Boskovic Inst, Bijenicka Cesta 54, Zagreb 10000, Croatia..
    Gerst, R-B
    Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
    Gibelin, J.
    Univ Caen, ENSICAEN, LPC Caen, CNRS IN2P3, F-14050 Caen, France..
    Hahn, K. , I
    Holl, M.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Kahlbow, J.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Kim, D.
    Ewha Womans Univ, Seoul 03760, South Korea.;Inst for Basic Sci Korea, Daejeon 34126, South Korea..
    Korper, D.
    GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany..
    Koiwai, T.
    Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan..
    Kondo, Y.
    Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 O Okayama, Tokyo 1528551, Japan..
    Koseoglou, P.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany.;GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany..
    Lee, J.
    Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong 999077, Peoples R China..
    Lehr, C.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Linh, B. D.
    VINATOM, Inst Nucl Sci & Technol, POB 5T-160, Hanoi, Vietnam..
    Lokotko, T.
    Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong 999077, Peoples R China..
    MacCormick, M.
    CNRS, IPN Orsay, F-91406 Orsay, France.;Univ Paris Saclay, F-91406 Orsay, France..
    Miki, K.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany.;Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA.;Tohoku Univ, Dept Phys, Aoba Ku, 6-3 Aramaki Aoba, Sendai, Miyagi 9808578, Japan..
    Moschner, K.
    Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
    Nakamura, T.
    Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 O Okayama, Tokyo 1528551, Japan..
    Park, S. Y.
    Ewha Womans Univ, Seoul 03760, South Korea.;Inst for Basic Sci Korea, Daejeon 34126, South Korea..
    Rossi, D.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany.;GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany..
    Sahin, E.
    Univ Oslo, Dept Phys, N-0316 Oslo, Norway..
    Schindler, F.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Simon, H.
    GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany..
    Soderstrom, P-A
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Sohler, D.
    Atomki, POB 51, H-4001 Debrecen, Hungary..
    Takeuchi, S.
    Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 O Okayama, Tokyo 1528551, Japan..
    Tornqvist, H.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany.;GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany..
    Tscheuschner, J.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Vaquero, V.
    CSIC, Inst Estruct Mat, E-28006 Madrid, Spain..
    Wagner, V
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Wang, S.
    Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China..
    Werner, V
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Xu, X.
    Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong 999077, Peoples R China..
    Yamada, H.
    Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 O Okayama, Tokyo 1528551, Japan..
    Yan, D.
    Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China..
    Yang, Z.
    RIKEN Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Yasuda, M.
    Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 O Okayama, Tokyo 1528551, Japan..
    Zanetti, L.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Pairing Forces Govern Population of Doubly Magic Ca-54 from Direct Reactions2021In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 126, no 25, article id 252501Article in journal (Refereed)
    Abstract [en]

    Direct proton-knockout reactions of Sc-55 at similar to 220 MeV/nucleon were studied at the RIKEN Radioactive Isotope Beam Factory. Populated states of Ca-54 were investigated through -ray and invariant-mass spectroscopy. Level energies were calculated from the nuclear shell model employing a phenomenological intemucleon interaction. Theoretical cross sections to states were calculated from distorted-wave impulse approximation estimates multiplied by the shell model spectroscopic factors, which describe the wave function overlap of the Sc-55 ground state with states in Ca-54. Despite the calculations showing a significant amplitude of excited neutron configurations in the ground-state of Sc-55, valence proton removals populated predominantly the ground state of Ca-54. This counterintuitive result is attributed to pairing effects leading to a dominance of the ground-state spectroscopic factor. Owing to the ubiquity of the pairing interaction, this argument should be generally applicable to direct knockout reactions from odd-even to even-even nuclei.

  • 291.
    Brunsell, Per
    et al.
    KTH, Superseded Departments (pre-2005), Alfvén Laboratory.
    Yadikin, Dimitry
    KTH, Superseded Departments (pre-2005), Alfvén Laboratory.
    Gregoratto, D.
    Paccagnella, R.
    Bolzonella, T.
    Cavinato, M.
    Cecconello, Marco
    KTH, Superseded Departments (pre-2005), Alfvén Laboratory.
    Drake, James Robert
    KTH, Superseded Departments (pre-2005), Alfvén Laboratory.
    Luchetta, A.
    Manduchi, G.
    Marchiori, G.
    Marrelli, L.
    Martin, P.
    Masiello, A.
    Milani, F.
    Ortolani, S.
    Spizzo, G.
    Zanca, P.
    Feedback Stabilization of Multiple Resistive Wall Modes2004In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 93, no 22, p. 225001-Article in journal (Refereed)
    Abstract [en]

    Active feedback stabilization of multiple independent resistive wall modes is experimentally demonstrated in a reversed-field pinch plasma. A reproducible simultaneous suppression of several nonresonant resistive wall modes is achieved. Coupling of different modes due to the limited number of the feedback coils is observed in agreement with theory. The feedback stabilization of nonresonant RWMs also has an effect on tearing modes that are resonant in the central plasma, leading to a significant prolongation of the discharge pulse.

  • 292. Bugge, Audun Nystad
    et al.
    Sauge, Sebastien
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Ghazali, Aina Mardhiyah M.
    Skaar, Johannes
    Lydersen, Lars
    Makarov, Vadim
    Laser Damage Helps the Eavesdropper in Quantum Cryptography2014In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, no 7, p. 070503-Article in journal (Refereed)
    Abstract [en]

    We propose a class of attacks on quantum key distribution (QKD) systems where an eavesdropper actively engineers new loopholes by using damaging laser illumination to permanently change properties of system components. This can turn a perfect QKD system into a completely insecure system. A proof-of-principle experiment performed on an avalanche photodiode-based detector shows that laser damage can be used to create loopholes. After similar to 1 W illumination, the detectors' dark count rate reduces 2-5 times, permanently improving single-photon counting performance. After similar to 1.5 W, the detectors switch permanently into the linear photodetection mode and become completely insecure for QKD applications.

  • 293. Burakovsky, L.
    et al.
    Chen, S. P.
    Preston, D. L.
    Belonoshko, Anatoly
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Rosengren, Anders
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Mikhaylushkin, A. S.
    Simak, S. I.
    Moriarty, J. A.
    High-Pressure-High-Temperature Polymorphism in Ta: Resolving an Ongoing Experimental Controversy2010In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 104, no 25, p. 255702-Article in journal (Refereed)
    Abstract [en]

    Phase diagrams of refractory metals remain essentially unknown. Moreover, there is an ongoing controversy over the high-pressure melting temperatures of these metals: results of diamond anvil cell (DAC) and shock wave experiments differ by at least a factor of 2. From an extensive ab initio study on tantalum we discovered that the body-centered cubic phase, its physical phase at ambient conditions, transforms to another solid phase, possibly hexagonal omega phase, at high temperature. Hence the sample motion observed in DAC experiments is very likely not due to melting but internal stresses accompanying a solid-solid transformation, and thermal stresses associated with laser heating.

  • 294.
    Busto, David
    et al.
    Lund Univ, Dept Phys, POB 118, SE-22100 Lund, Sweden..
    Vinbladh, Jimmy
    Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden..
    Zhong, Shiyang
    Lund Univ, Dept Phys, POB 118, SE-22100 Lund, Sweden..
    Isinger, Marcus
    Lund Univ, Dept Phys, POB 118, SE-22100 Lund, Sweden..
    Nandi, Saikat
    Lund Univ, Dept Phys, POB 118, SE-22100 Lund, Sweden..
    Maclot, Sylvain
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics. Lund Univ, Dept Phys, POB 118, SE-22100 Lund, Sweden..
    Johnsson, Per
    Lund Univ, Dept Phys, POB 118, SE-22100 Lund, Sweden..
    Gisselbrecht, Mathieu
    Lund Univ, Dept Phys, POB 118, SE-22100 Lund, Sweden..
    L'Huillier, Anne
    Lund Univ, Dept Phys, POB 118, SE-22100 Lund, Sweden..
    Lindroth, Eva
    Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden..
    Dahlström, Jan Marcus
    Lund Univ, Dept Phys, POB 118, SE-22100 Lund, Sweden..
    Fano's Propensity Rule in Angle-Resolved Attosecond Pump-Probe Photoionization2019In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, no 13, article id 133201Article in journal (Refereed)
    Abstract [en]

    In a seminal article, Fano predicts that absorption of light occurs preferably with increase of angular momentum. We generalize Fano's propensity rule to laser-assisted photoionization, consisting of absorption of an extreme-ultraviolet photon followed by absorption or emission of an infrared photon. The predicted asymmetry between absorption and emission leads to incomplete quantum interference in attosecond photoelectron interferometry. It explains both the angular dependence of the photoionization time delays and the delay dependence of the photoelectron angular distributions. Our theory is verified by experimental results in Ar in the 20-40 eV range.

  • 295.
    Bychkov, Vitaly
    et al.
    Institute of Physics, Umeå University.
    Valiev, Damir
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Eriksson, Lars-Erik
    Department of Applied Mechanics, Chalmers University of Technology.
    Physical Mechanism of Ultrafast Flame Acceleration2008In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, no 16, p. 164501-1-164501-4Article in journal (Refereed)
    Abstract [en]

    We explain the physical mechanism of ultrafast flame acceleration in obstructed channels used in modern experiments on detonation triggering. It is demonstrated that delayed burning between the obstacles creates a powerful jetflow, driving the acceleration. This mechanism is much stronger than the classical Shelkin scenario of flame acceleration due to nonslip at the channel walls. The mechanism under study is independent of the Reynolds number, with turbulence playing only a supplementary role. The flame front accelerates exponentially; the analytical formula for the growth rate is obtained. The theory is validated by extensive direct numerical simulations and comparison to previous experiments.

  • 296.
    Cangemi, Lucile
    et al.
    Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden.
    Chiodaroli, Marco
    Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden.
    Johansson, Henrik
    Nordita SU; Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden.
    Ochirov, Alexander
    Mathematical Institute, University of Oxford, Woodstock Rd, Oxford OX2 6GG, United Kingdom; London Institute for Mathematical Sciences, Royal Institution, 21 Albemarle St, London W1S 4BS, United Kingdom.
    Pichini, Paolo
    Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden.
    Skvortsov, Evgeny
    Service de Physique de l'Univers, Champs et Gravitation, Université de Mons, 20 place du Parc, 7000 Mons, Belgium.
    Kerr Black Holes From Massive Higher-Spin Gauge Symmetry2023In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 131, no 22, article id 221401Article in journal (Refereed)
    Abstract [en]

    We propose that the dynamics of Kerr black holes is strongly constrained by the principle of gauge symmetry. We initiate the construction of effective field theories for Kerr black holes of any integer quantum spin s using Stückelberg fields, and show that the known three-point Kerr amplitudes are uniquely predicted using massive higher-spin gauge symmetry. This symmetry is argued to be connected to an enhanced range of validity for the Kerr effective field theories. We consider the closely related root-Kerr electromagnetic solution in parallel, for which the dynamical interactions with photons are also constrained by massive higher-spin gauge symmetry. Finally, the spin-s Compton amplitudes are analyzed, and we discuss contact-term constraints at s=2 from Ward identities.

  • 297.
    Canton, Jacopo
    et al.
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics.
    Rinaldi, Enrico
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics. Royal Inst Technol, Linne FLOW Ctr KTH Mech, SE-10044 Stockholm, Sweden..
    Örlü, Ramis
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics.
    Schlatter, Philipp
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics.
    Critical Point for Bifurcation Cascades and Featureless Turbulence2020In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 124, no 1, article id 014501Article in journal (Refereed)
    Abstract [en]

    In this Letter we show that a bifurcation cascade and fully sustained turbulence can share the phase space of a fluid flow system, resulting in the presence of competing stable attractors. We analyze the toroidal pipe flow, which undergoes subcritical transition to turbulence at low pipe curvatures (pipe-to-torus diameter ratio) and supercritical transition at high curvatures, as was previously documented. We unveil an additional step in the bifurcation cascade and provide evidence that, in a narrow range of intermediate curvatures, its dynamics competes with that of sustained turbulence emerging through subcritical transition mechanisms.

  • 298. Carling, Karin
    et al.
    Wahnström, Göran
    Mattsson, Thomas R
    Mattsson, Ann E
    Sandberg, Nils
    KTH, Superseded Departments (pre-2005), Physics.
    Grimvall, Göran
    Vacancies in metals: From first-principles calculations to experimental data2000In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 85, no 18, p. 3862-3865Article in journal (Refereed)
    Abstract [en]

    We have revealed, and resolved, an apparent inability of density functional theory, within the local density and generalized gradient approximations, to describe vacancies in Al accurately and consistently. The shortcoming is due to electron correlation effects near electronic edges and we show how to correct for them. We find that the divacancy in Al is energetically unstable and we show that anharmonic atomic vibrations explain the non-Arrhenius temperature dependence of the vacancy concentration.

  • 299. Carlstrom, Johan
    et al.
    Prokofiev, Nikolay
    KTH, School of Engineering Sciences (SCI), Theoretical Physics. University of Massachusetts, United States; Kurchatov Institute, Russian Federation.
    Svistunov, Boris
    Quantum Walk in Degenerate Spin Environments2016In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, no 24, article id 247202Article in journal (Refereed)
    Abstract [en]

    We study the propagation of a hole in degenerate (paramagnetic) spin environments. This canonical problem has important connections to a number of physical systems, and is perfectly suited for experimental realization with ultracold atoms in an optical lattice. At the short-to-intermediate time scale that we can access using a stochastic-series-type numeric scheme, the propagation turns out to be distinctly nondiffusive with the probability distribution featuring minima in both space and time due to quantum interference, yet the motion is not ballistic, except at the beginning. We discuss possible scenarios for long-term evolution that could be explored with an unprecedented degree of detail in experiments with single-atom resolved imaging.

  • 300.
    Carlström, Johan
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.
    Babaev, Egor
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics. University of Massachusetts, United States.
    Entropy- and Flow-Induced Superfluid States2014In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 5, p. 055301-Article in journal (Refereed)
    Abstract [en]

    Normally the role of phase fluctuations in superfluids and superconductors is to drive a phase transition to the normal state. This happens due to proliferation of topologically nontrivial phase fluctuations in the form of vortices. Here we discuss a class of systems where, by contrast, nontopological phase fluctuations can produce superfluidity. Here we understand superfluidity as a phenomenon that does not necessarily arises from a broken U(1) symmetry, but can be associated with a certain class of (approximate or exact) degeneracies of the system's energy landscape giving raise to a U(1)-like phase.

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