The proximity effect from a spin-triplet px-wave superconductor to a dirty normal-metal has been shown to result in various unusual electromagnetic properties, reflecting a cooperative relation between topologically protected zero-energy quasiparticles and odd-frequency Cooper pairs. However, because of a lack of candidate materials for spin-triplet px-wave superconductors, observing this effect has been difficult. In this paper, we demonstrate that the anomalous proximity effect, which is essentially equivalent to that of a spin-triplet px-wave superconductor, can occur in a semiconductor/high-Tc cuprate superconductor hybrid device in which two potentials coexist: a spin-singlet d-wave pair potential and a spin--orbit coupling potential sustaining the persistent spin-helix state. As a result, we propose an alternative and promising route to observe the anomalous proximity effect related to the profound nature of topologically protected quasiparticles and odd-frequency Cooper pairs.
@article{arxiv.2104.04246,
title = {Strong anomalous proximity effect from spin-singlet superconductors},
author = {Satoshi Ikegaya and Jaechul Lee and Andreas P. Schnyder and Yasuhiro Asano},
journal= {arXiv preprint arXiv:2104.04246},
year = {2021}
}