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TT: Fachverband Tiefe Temperaturen
TT 45: PtBi2 and Weyl Superconductors
TT 45.6: Talk
Wednesday, March 20, 2024, 12:45–13:00, H 3010
Axion electrodynamics of Weyl superconductors with broken time-reversal symmetry — •Flavio Nogueira1, Vira Shyta1, and Jeroen van den Brink1,2 — 1Institute for Theoretical Solid State Physics, IFW Dresden — 2Institute for Theoretical Physics and Würzburg-Dresden Cluster of Excellence ct.qmat
Weyl superconductors with broken time-reversal symmetry are effectively described by a Higgs axion electrodynamics, where the axion term is given by a magnetoelectric coupling yielding a planar Hall effect in the normal phase. This leads to significant changes in the electrodynamics of superconductors. Here we investigate how the application of an external magnetic field changes the nature of superconductivity both in absence and in the presence of vortices. In fact, due to the axion term, an electric field is generated, which in turn induces electric charge densities on the material surfaces, thus leading to interesting vortex dynamics on the surface. An interesting result following from our analysis is an axion-induced ac Josephson effect provided the sample is thin enough.
Keywords: Weyl semimetals; superconductivity; vortices; axion electrodynamics