Mechanisms of Andreev reflection in quantum Hall graphene
Mesoscale and Nanoscale Physics
2022-12-16 v4
Abstract
We simulate a hybrid superconductor-graphene device in the quantum Hall regime to identify the origin of downstream resistance oscillations in a recent experiment [Zhao et. al. Nature Physics 16, (2020)]. In addition to the previously studied Mach-Zehnder interference between the valley-polarized edge states, we consider disorder-induced scattering, and the previously overlooked appearance of the counter-propagating states generated by the interface density mismatch. Comparing our results with the experiment, we conclude that the observed oscillations are induced by the interfacial disorder, and that lattice-matched superconductors are necessary to observe the alternative ballistic effects.
Keywords
Cite
@article{arxiv.2103.06722,
title = {Mechanisms of Andreev reflection in quantum Hall graphene},
author = {Antonio L. R. Manesco and Ian Matthias Flór and Chun-Xiao Liu and Anton R. Akhmerov},
journal= {arXiv preprint arXiv:2103.06722},
year = {2022}
}
Comments
16 pages, 7 figures