Andreev magnetointerferometry in topological hybrid junctions
Pierre Carmier
DOI 10.1103/PhysRevB.88.165415 · Physical Review B
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Abstract
We investigate the fate of topological edge states in the quantum Hall (QH) regime when they experience tunneling processes through a narrow superconducting (S) strip. By computing the charge conductance flowing through a graphene-based QH/S/QH junction, the S strip is shown to act as an Andreev interferometer, giving rise to spectacular conductance oscillations as a function of the Landau level filling factor. We provide a semiclassical analysis allowing for a natural interpretation of these oscillations in terms of interferences between electron and hole trajectories propagating along the QH/S interfaces. Our results suggest that nontrivial junctions between topologically distinct phases could offer a highly tunable means of partitioning the flow of edge states.
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