Andreev bound states and tunneling characteristics of a non-centrosymmetric superconductor

TL;DR

This paper investigates tunneling behaviors in non-centrosymmetric superconductors, revealing zero-bias anomalies caused by Andreev bound states, which help understand the pairing symmetry in such materials.

Contribution

It demonstrates how tunneling measurements can identify the parity-mixed pairing state in non-centrosymmetric superconductors like CePt3Si.

Findings

Zero-bias anomalies are linked to Andreev bound states.

Tunneling characteristics vary with junction direction.

The study provides a method to probe pairing symmetry.

Abstract

The tunneling characteristics of planar junctions between a normal metal and a non-centrosymmetric superconductor like CePt3Si are examined. It is shown that the superconducting phase with mixed parity can give rise to characteristic zero-bias anomalies in certain junction directions. The origin of these zero-bias anomalies are Andreev bound states at the interface. The tunneling characteristics for different directions allow to test the structure of the parity-mixed pairing state.