Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor

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2019-09-10

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Abstract

© 2019 American Physical Society. 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.

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10.1103/PhysRevB.100.121403

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Wei, MT, AW Draelos, A Seredinski, CT Ke, H Li, Y Mehta, K Watanabe, T Taniguchi, et al. (2019). Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor. Physical Review B, 100(12). 10.1103/PhysRevB.100.121403 Retrieved from https://hdl.handle.net/10161/19633.

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Scholars@Duke

Finkelstein

Gleb Finkelstein

Professor of Physics

Gleb Finkelstein is an experimentalist interested in physics of quantum nanostructures, such as Josephson junctions and quantum dots made of carbon nanotubes, graphene, and topological materials. These objects reveal a variety of interesting electronic properties that may form a basis for future quantum devices.


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