Impurity-induced states in superconducting heterostructures
Abstract
Heterostructures allow the realization of electronic states that are difficult to obtain in isolated systems. Exemplary is the case of quasi-one-dimensional heterostructures formed by a superconductor and a semiconductor with spin-orbit coupling in which Majorana zero-energy modes can be realized. We study the effect of a single impurity on the spectrum of superconducting heterostructures. We find that the coupling between the superconductor and the semiconductor can strongly affect the impurity-induced states and may induce additional subgap bound states that are not present in isolated uniform superconductors. For the case of quasi-one-dimensional superconductor/semiconductor heterostructures, we obtain the conditions for which the low-energy impurity-induced bound states appear.
Cite
@article{arxiv.1711.04056,
title = {Impurity-induced states in superconducting heterostructures},
author = {Dong E. Liu and Enrico Rossi and Roman M. Lutchyn},
journal= {arXiv preprint arXiv:1711.04056},
year = {2018}
}
Comments
8 pages, 7 figures with a few minor changes