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  • 1.
    Garaud, Julien
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Sellin, Karl A. H.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.
    Jäykkä, Juha
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Babaev, Egor
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.
    Skyrmions induced by dissipationless drag in U(1)xU(1) superconductors2014In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, no 10, p. 104508-Article in journal (Refereed)
    Abstract [en]

    Rather generically, multicomponent superconductors and superfluids have intercomponent current-current interaction. We show that in superconductors with substantially strong intercomponent drag interaction, the topological defects which form in an external field are characterized by a skyrmionic topological charge. We then demonstrate that they can be distinguished from ordinary vortex matter by a very characteristic magnetization process due to the dipolar nature of inter-skyrmion forces. The results provide an experimental signature to confirm or rule out the formation p-wave state with reduced spin stiffness in p-wave superconductors.

  • 2. Gillis, San
    et al.
    Jäykkä, Juha
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Milosevic, Milorad V.
    Vortex states in mesoscopic three-band superconductors2014In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, no 2, p. 024512-Article in journal (Refereed)
    Abstract [en]

    Using multicomponent Ginzburg-Landau simulations, we show a plethora of vortex states possible in mesoscopic three-band superconductors. We find that mesoscopic confinement stabilizes chiral states, with nontrivial phase differences between the band condensates, as the ground state of the system. As a consequence, we report the broken-symmetry vortex states, the chiral states where vortex cores in different band condensates do not coincide (split-core vortices), as well as fractional-flux vortex states with broken time-reversal symmetry.

  • 3. Harland, Derek
    et al.
    Jäykkä, Juha
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Shnir, Yakov
    Speight, Martin
    Isospinning hopfions2013In: Journal of Physics A: Mathematical and Theoretical, ISSN 1751-8113, E-ISSN 1751-8121, Vol. 46, no 22, p. 225402-Article in journal (Refereed)
    Abstract [en]

    The problem of constructing internally rotating solitons of fixed angular frequency omega in the Faddeev-Skyrme model is reformulated as a variational problem for an energy-like functional, called pseudoenergy, which depends parametrically on omega. This problem is solved numerically using a gradient descent method, without imposing any spatial symmetries on the solitons, and the dependence of the solitons' energy on omega, and on their conserved total isospin J, studied. It is found that, generically, the shape of a soliton is independent of omega, and that its size grows monotonically with omega. A simple elastic rod model of time-dependent hopfions is developed which, despite having only one free parameter, accounts well for most of the numerical results.

  • 4. Palonen, H.
    et al.
    Jäykkä, Juha
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Paturi, P.
    Giant vortex states in type I superconductors simulated by Ginzburg-Landau equations2013In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 25, no 38, p. 385702-Article in journal (Refereed)
    Abstract [en]

    The quantization of magnetic flux in superconductors is usually seen as vortices penetrating the sample. While vortices are unstable in bulk type I superconductors, restricting the superconductor causes a variety of vortex structures to appear. We present a systematic study of giant vortex states in type I superconductors obtained by numerically solving the Ginzburg-Landau equations. The size of the vortices is seen to increase with decreasing film thickness. In type I superconductors, giant vortices appear at intermediate thicknesses but they do not form a well-defined vortex lattice. In the thinnest type I films, singly quantized vortices seem to be stabilized by the geometry of the sample instead of an increase in the effective Ginzburg-Landau parameter.

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