Hybrid semiconductor-superconductor nanowires are predicted to host Majorana zero modes, manifested as zero-bias peaks (ZBPs) in tunneling conductance. ZBPs alone, however, are not sufficient evidence due to the ubiquitous presence of Andreev bound states in the same system. Here, we implement a strongly resistive normal lead in our InAs-Al nanowire devices and show that most of the expected ZBPs, corresponding to zero-energy Andreev bound states, can be suppressed, a phenomenon known as environmental Coulomb blockade. Our result is the first experimental demonstration of this dissipative interaction effect on Andreev bound states and can serve as a possible filter to narrow down ZBP phase diagram in future Majorana searches.
@article{arxiv.2111.00708,
title = {Suppressing Andreev bound state zero bias peaks using a strongly dissipative lead},
author = {Shan Zhang and Zhichuan Wang and Dong Pan and Hangzhe Li and Shuai Lu and Zonglin Li and Gu Zhang and Donghao Liu and Zhan Cao and Lei Liu and Lianjun Wen and Dunyuan Liao and Ran Zhuo and Runan Shang and Dong E Liu and Jianhua Zhao and Hao Zhang},
journal= {arXiv preprint arXiv:2111.00708},
year = {2022}
}
Comments
Raw data and processing codes within this paper are available at https://doi.org/10.5281/zenodo.5630076