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  • 1.
    Ferreiros, Yago
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Kedem, Yaron
    Bergholtz, Emil J.
    Bardarson, Jensen. H.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Mixed Axial-Torsional Anomaly in Weyl Semimetals2019Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, nr 5, artikkel-id 056601Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We show that Weyl semimetals exhibit a mixed axial-torsional anomaly in the presence of axial torsion, a concept exclusive of these materials with no known natural fundamental interpretation in terms of the geometry of spacetime. This anomaly implies a nonconservation of the axial current - the difference in the current of left- and right-handed chiral fermions - when the torsion of the spacetime in which the Weyl fermions move couples with opposite sign to different chiralities. The anomaly is activated by driving transverse sound waves through a Weyl semimetal with a spatially varying tilted dispersion, which can be engineered by applying strain. This leads to a sizable alternating current in the presence of a magnetic field that provides a clear-cut experimental signature of our predictions.

  • 2.
    Ferreiros, Yago
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kondenserade materiens teori.
    Vozmediano, Maria A. H.
    Elastic gauge fields and Hall viscosity of Dirac magnons2018Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, nr 5, artikkel-id 054404Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We analyze the coupling of elastic lattice deformations to the magnon degrees of freedom of magnon Dirac materials. For a honeycomb ferromagnet we find that, as happens in the case of graphene, elastic gauge fields appear coupled to the magnon pseudospinors. For deformations that induce constant pseudomagnetic fields, the spectrum around the Dirac nodes splits into pseudo-Landau levels. We show that when a Dzyaloshinskii-Moriya interaction is considered, a topological gap opens in the system and a Chern-Simons effective action for the elastic degrees of freedom is generated. Such a term encodes a phonon Hall viscosity response, entirely generated by quantum fluctuations of magnons living in the vicinity of the Dirac points. The magnon Hall viscosity vanishes at zero temperature, and grows as temperature is raised and the states around the Dirac points are increasingly populated.

  • 3.
    Ferreiros, Yago
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kondenserade materiens teori.
    Zyuzin, A. A.
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kondenserade materiens teori.
    Bardarson, Jens H
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kondenserade materiens teori.
    Anomalous Nernst and thermal Hall effects in tilted Weyl semimetals2017Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, nr 11, artikkel-id 115202Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study the anomalous Nernst and thermal Hall effects in a linearized low-energy model of a tilted Weyl semimetal, with two Weyl nodes separated in momentum space. For inversion symmetric tilt, we give analytic expressions in two opposite limits: For a small tilt, corresponding to a type-I Weyl semimetal, the Nernst conductivity is finite and independent of the Fermi level; for a large tilt, corresponding to a type-II Weyl semimetal, it acquires a contribution depending logarithmically on the Fermi energy. This result is in a sharp contrast to the nontilted case, where the Nernst response is known to be zero in the linear model. The thermal Hall conductivity similarly acquires Fermi surface contributions, which add to the Fermi level-independent, zero-tilt result, and is suppressed as one over the tilt parameter at half filling in the type-II phase. In the case of inversion-breaking tilt, with the tilting vector of equal modulus in the two Weyl cones, all Fermi surface contributions to both anomalous responses cancel out, resulting in zero Nernst conductivity. We discuss two possible experimental setups, representing open and closed thermoelectric circuits.

  • 4.
    Pozo, Oscar
    et al.
    Inst Ciencia Mat Madrid, Madrid 28049, Spain.;CSIC, Madrid 28049, Spain..
    Ferreiros, Yago
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kondenserade materiens teori.
    Vozmediano, Maria A. H.
    Inst Ciencia Mat Madrid, Madrid 28049, Spain.;CSIC, Madrid 28049, Spain..
    Anisotropic fixed points in Dirac and Weyl semimetals2018Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, nr 11, artikkel-id 115122Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The effective low energy description of interacting Dirac and Weyl semimetals is that of massless quantum electrodynamics with several Lorentz breaking material parameters. We perform a renormalization group analysis of Coulomb interaction in anisotropic Dirac and Weyl semimetals and show that the anisotropy persists in the material systems at the infrared fixed point. In addition, a tilt of the fermion cones breaking inversion symmetry induces a magnetoelectric term in the electrodynamics of the material whose magnitude runs to match that of the electronic tilt at the fixed point.

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