Chiral Meissner state in time-reversal invariant Weyl superconductors

Chiral Meissner state in time-reversal invariant Weyl superconductors

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Weyl semimetals have nodes in their electronic structure at which electrons attain a definite chirality.Due to the chiral anomaly, the nonconservation 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 superconductors (SCs) in the London regime.For type II SCs the axion coupling generates magnetic B fields transverse 3 piece horse wall art to vortices, which become unstable at a critical coupling so that a transition into type I SC ensues.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 field.

Consequently, when penetrating into the bulk the B field starts to steadily rotate away from the applied click here field.At a critical coupling the screening of the magnetic field breaks down.The novel chiral superconducting state that emerges has a periodically divergent susceptibility that separates onsets of chiral Meissner regimes.The chiral anomaly thus leaves very crisp experimental signatures in structurally chiral Weyl SCs with an axion response.