Quantum anomalies in superconducting Weyl metals

TL;DR

This paper explores the topological field theory of superconducting Weyl metals, revealing how quantum anomalies like the chiral and parity-like anomalies manifest as surface states and are influenced by superconductivity.

Contribution

It introduces a topological field theory framework that explains the surface phenomena and quantum anomalies in superconducting Weyl metals, linking them to underlying topological properties.

Findings

Fermi arc and Andreev bound states are linked to chiral and parity-like anomalies.

Superconductivity influences the manifestation of quantum anomalies.

The theory predicts topological behaviors for different pairing states.

Abstract

We theoretically study the quantum anomalies in the superconducting Weyl metals based on the topological field theory. It is demonstrated that the Fermi arc and the surface Andreev bound state, characteristic of the superconducting Weyl metals, are the manifestations of two underlying phenomenon, namely the chiral anomaly and the parity-like anomaly, respectively. The first anomaly is inherited from the Berry curvature around the original Weyl points, while the second is the result of the superconductivity. We show that, all the fascinating topological behavior of the superconducting Weyl metals, either intranode FFLO or the internode BCS pairing state, can be satisfactorily described and predicted by our topological field theory.