Mechanisms of Andreev reflection in quantum Hall graphene
Antonio L. R. Manesco, Ian Matthias Flór, Chun-Xiao Liu, Anton R. Akhmerov
SciPost Phys. Core 5, 045 (2022) · published 27 September 2022
- doi: 10.21468/SciPostPhysCore.5.3.045
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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.
Cited by 15
Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- 1 2 Antonio L. R. Manesco,
- 1 Ian Matthias Flór,
- 1 Chun-Xiao Liu,
- 1 Anton R. Akhmerov
- 1 Technische Universiteit Delft / Delft University of Technology [TU Delft]
- 2 Universidade de São Paulo / University of Sao Paulo [USP]