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TT: Fachverband Tiefe Temperaturen
TT 42: Superconductivity: Tunneling and Josephson Junctions
TT 42.13: Vortrag
Donnerstag, 20. März 2025, 12:45–13:00, H32
Chiral Interference Pattern in Tunneling Junctions and SQUIDs Made of Time-Reversal Invariant Weyl Superconductors — •Anastasiia Chyzhykova1, 2, Vira Shyta1, Jeroen van den Brink1, and Flavio Nogueira1 — 1Leibniz Institute for Solid State and Materials Research, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — 2Technische Universität Dresden
In recent years a number of experiments have reported superconductivity in various Weyl semimetals. The low-energy electromagnetic response of Weyl semimetals is governed by the axion term in the action arising due to the chiral anomaly. A recent publication [1] demonstrated that the time-reversal invariant Weyl superconductors (SCs) exhibit a chiral Meissner state. In our work we explore the influence of the chiral Meissner state on the tunnel junctions and squids made of time-reversal invariant Weyl SCs. We derive a modified Fraunhofer interference pattern in such a junction and demonstrate how the presence of the axion term affects Josephson energy in asymmetric squids and Berry phase in charge qubits. The effect of the chiral Meissner state manifests as a temperature-dependent deficit flux, which provides a new tuning parameter compared to ordinary squids.
[1] V.Shyta, J.van den Brink, F.S.Nogueira, Phys.Rev.Res. 6, 013240 (2024).
Keywords: Weyl Superconductor; Axion Electrodynamics; Chiral Interference Pattern