Chiral Quasiparticle Tunneling Between Quantum Hall Edges in Proximity with a Superconductor

Abstract

We study a two-terminal graphene Josephson junction with contacts shaped to form a narrow constriction, less than 100nm in length. The contacts are made from type II superconducting contacts and able to withstand magnetic fields high enough to reach the quantum Hall (QH) regime in graphene. In this regime, the device conductance is determined by edge states, plus the contribution from the constricted region. In particular, the constriction area can support supercurrents up to fields of ~2.5T. Moreover, enhanced conductance is observed through a wide range of magnetic fields and gate voltages. This additional conductance and the appearance of supercurrent is attributed to the tunneling between counter-propagating quantum Hall edge states along opposite superconducting contacts.

arXiv comment4 pages, 3 figures

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Cited by in corpus (5)

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• One-dimensional proximity superconductivity in the quantum Hall regime
• Finite field transport response of a dilute magnetic topological insulator based Josephson junction
• Proximity-induced charge density wave in a metallic system
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