Odd-frequency superconducting pairing in topological insulators
Abstract
We discuss the appearance of odd-frequency spin-triplet s-wave superconductivity, first proposed by Berezinskii [{\it JETP} {\bf 20}, 287 (1974)], on the surface of a topological insulator proximity coupled to a conventional spin-singlet s-wave superconductor. Using both analytical and numerical methods we show that this disorder robust odd-frequency state is present whenever there is an in-surface gradient in the proximity induced gap, including superconductor-normal state (SN) junctions. The time-independent order parameter for the odd-frequency superconductor is proportional to the in-surface gap gradient. The induced odd-frequency component does not produce any low-energy states.
Keywords
Cite
@article{arxiv.1208.4315,
title = {Odd-frequency superconducting pairing in topological insulators},
author = {Annica M. Black-Schaffer and Alexander V. Balatsky},
journal= {arXiv preprint arXiv:1208.4315},
year = {2015}
}
Comments
6 pages, 5 figures. v2 contains minor changes + supplementary material