Kavli Affiliate: Anton R. Akhmerov
| First 5 Authors: Antonio L. R. Manesco, Ian Matthias Flór, Chun-Xiao Liu, Anton R. Akhmerov,
| 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 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.
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