Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor
M. T. Wei, A. W. Draelos, A. Seredinski, C. T. Ke, H. Li, Y. Mehta, K. Watanabe, T. Taniguchi, M. Yamamoto, S. Tarucha, G. Finkelstein, F. Amet, I. V. Borzenets
DOI 10.1103/PhysRevB.100.121403 · Physical Review B
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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 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. Additionally, 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 counterpropagating quantum Hall edge states along opposite superconducting contacts.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MoRe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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