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- W4387142917 abstract "Weyl semimetals are characterised by pairs of topologically protected nodes at which electronic bands cross and electrons attain a definite chirality. Due to the chiral anomaly, the non-conservation of charges with given chirality, the axion term appears in their effective electromagnetic action. We determine how this affects the properties of time-reversal invariant Weyl {it superconductors} (SCs) in the London regime. For type II SCs we show that axion coupling generates magnetic $B$-fields transverse to a vortex. Above a critical axion coupling the vortex become unstable and a transition into a type I SC follows. In this regime an applied $B$-field not only decays inside the SC within the London penetration depth, but the axion coupling generates an additional perpendicular magnetic field. Consequently the field inside the superconductor progressively rotates away from the applied one when going into the bulk. At a critical coupling the Meissner state breaks down. The novel chiral SC state that then emerges has a periodically divergent susceptibility, at which the winding of $B$ inside the superconductor jumps. Thus the axion coupling leaves crisp experimentally observable signatures in Weyl SCs." @default.
- W4387142917 created "2023-09-29" @default.
- W4387142917 creator A5033058876 @default.
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- W4387142917 date "2023-09-25" @default.
- W4387142917 modified "2023-10-18" @default.
- W4387142917 title "Chiral Meissner effect in time-reversal invariant Weyl superconductors" @default.
- W4387142917 doi "https://doi.org/10.48550/arxiv.2309.14262" @default.
- W4387142917 hasPublicationYear "2023" @default.
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