Toroflux: A counterpart of the Chandrasekhar-Kendall state in noncentrosymmetric superconductors
Résumé
We demonstrate that superconductors with broken inversion symmetry support a family of stable, spatially localized configurations of the self-knotted magnetic field. These solutions, that we term "toroflux", are the superconducting counterparts of the Chandrasekhar-Kendall states (spheromaks) that appear in highly conducting, force-free astrophysical and nuclear-fusion plasmas. The superconducting torofluxes are solutions of superconducting models, in the presence of a parity breaking Lifshitz invariant associated with the $O$ point group symmetry. We demonstrate that a magnetic dipole or a ferromagnetic inclusion in the bulk of a noncentrosymmetric superconductor source finite-energy toroflux solutions.
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