Mechanisms of Andreev reflection in quantum Hall graphene
A.L. Rigotti Manesco (Kavli institute of nanoscience Delft, TU Delft - QN/Akhmerov Group)
Ian Matthias Flór (Kavli institute of nanoscience Delft, Student TU Delft)
C. Liu (TU Delft - QRD/Wimmer Group, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
AR Akhmerov (Kavli institute of nanoscience Delft, TU Delft - QN/Akhmerov Group)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
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 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.
help_outline