Anomalous Andreev bound state in non-centrosymmetric superconductors

TL;DR

This paper investigates edge states in non-centrosymmetric superconductors, revealing an anomalous Andreev bound state and a topologically protected Majorana fermion that influence charge conductance.

Contribution

It demonstrates the existence of an anomalous Andreev bound state and a time-reversal invariant Majorana fermion in non-centrosymmetric superconductors with mixed pairing symmetries.

Findings

Anomalous dispersion of Andreev bound states for dxy-wave pairing.

Presence of a topologically protected Majorana fermion at the edge.

Zero bias conductance peak indicating Majorana fermion manifestation.

Abstract

We study edge states of non-centrosymmetric superconductors where spin-singlet d-wave pairing mixes with spin-triplet p (or f)-wave one by spin-orbit coupling. For dxy-wave pairing, the obtained Andreev bound state has an anomalous dispersion as compared to conventional helical edge modes. A unique topologically protected time-reversal invariant Majorana fermion appears at the edge. The charge conductance in the non-centrosymmetric superconductor junctions reflects the anomalous structures of the dispersions, particularly the time-reversal invariant Majorana fermion is manifested as a zero bias conductance peak.