Conductance of a junction between a normal metal and a Berezinskii superconductor

TL;DR

This paper theoretically investigates the conductance properties of a junction between a normal metal and a Berezinskii superconductor, highlighting unique features due to its odd-frequency pairing symmetry, which differ from conventional superconductors.

Contribution

It provides a theoretical analysis of conductance in N-Berezinskii superconductor junctions, emphasizing the impact of odd-frequency pairing on Andreev reflection and conductance behavior.

Findings

Conductance differs qualitatively from conventional superconductor junctions.

Odd-frequency pairing influences Andreev reflection sensitivity.

Results can help identify Berezinskii superconductivity experimentally.

Abstract

The conductance of a junction between a normal metal and a superconductor having the symmetry proposed by Berezinskii is studied theoretically. The main feature of this symmetry is the odd frequency dependence of the anomalous Green function, which makes possible the s-wave triplet superconducting state (the Berezinskii superconductor). The Andreev reflection (which links positive and negative energies) is sensitive to the energetic symmetry; as a result, the conductance of the junction involving the Berezinskii superconductor is qualitatively different from the case of a conventional superconductor. Experimentally, the obtained results can be employed to test the possibility of the Berezinskii superconductivity proposed for Na$_x$CoO$_2$ and to identify the odd-omega component predicted for superconductor-ferromagnet junctions.