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

Wei, M. T.; Draelos, A. W.; Seredinski, A.; Ke, C. T.; Li, H.; Mehta, Y.; Watanabe, K.; Taniguchi, T.; Yamamoto, M.; Tarucha, S.; Finkelstein, G.; Amet, F.; Borzenets, I. V.

doi:10.1103/physrevb.100.121403

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

Journal Article · Tue Sep 10 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.100.121403· OSTI ID:1737512

Wei, M. T. ^[1]; Draelos, A. W. ^[1]; Seredinski, A. ^[1]; Ke, C. T. ^[1]; Li, H. ^[2]; Mehta, Y. ^[2]; Watanabe, K. ^[3]; Taniguchi, T. ^[3]; Yamamoto, M. ^[4]; Tarucha, S. ^[4]; Finkelstein, G. ^[1]; Amet, F. ^[2];

^[5]

Duke Univ., Durham, NC (United States)
Appalachian State Univ., Boone, NC (United States)
National Inst. for Materials Science (NIMS), Tsukuba (Japan). Advanced Materials Lab.
Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Center for Emergent Matter Science (CEMS)
City Univ. of Hong Kong, Kowloon (Hong Kong)

We study a two-terminal graphene Josephson junction with contacts shaped to form a narrow constriction, less than 100 nm 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 ~2.5 T. Additionally, enhanced conductance is observed through a wide range of magnetic fields and gate voltages. In conclusion, 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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Research Organization:: Duke Univ., Durham, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Army Research Office (ARO); National Science Foundation (NSF)

Grant/Contract Number:: SC0002765; 38000131; 17H01138

OSTI ID:: 1737512

Journal Information:: Physical Review B, Vol. 100, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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

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