The anomalous proximity effect of a spin-triplet p-wave superconductor has been known as a part of the Majorana physics and is explained by the penetration of zero-energy states from a surface of a superconductor to a dirty normal metal. We demonstrate that a spin-singlet d-wave superconductor without any surface zero-energy states exhibits the anomalous proximity effect in the presence of a specific spin-orbit interaction. The results show the quantization of the zero-bias conductance in a dirty normal-metal/superconductor junction. We also discuss a relation between our findings and results in an experiment on a CoSi2/TiSi2 junction.
@article{arxiv.2501.17369,
title = {Anomalous proximity effect of a spin-singlet superconductor with a spin-orbit interaction},
author = {Jaechul Lee and Satoshi Ikegaya and Yasuhiro Asano},
journal= {arXiv preprint arXiv:2501.17369},
year = {2025}
}