Mechanisms of Andreev reflection in quantum Hall graphene

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 ed...

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Bibliographic Details
Published inSciPost physics core Vol. 5; no. 3; p. 045
Main Authors Manesco, Antonio, Flór, Ian Matthias, Liu, Chun-Xiao, Akhmerov, Anton
Format Journal Article
LanguageEnglish
Published SciPost 01.07.2022
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Summary: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 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.
ISSN:2666-9366
2666-9366
DOI:10.21468/SciPostPhysCore.5.3.045