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 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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Duke Univ., Durham, NC (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); US Army Research Office (ARO); National Science Foundation (NSF)
- OSTI Identifier:
- 1737512
- Grant/Contract Number:
- SC0002765; 38000131; 17H01138
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 12; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Graphene; superconductivity; quantum Hall effect
Citation Formats
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., and Borzenets, I. V. Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor. United States: N. p., 2019.
Web. doi:10.1103/physrevb.100.121403.
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. Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor. United States. https://doi.org/10.1103/physrevb.100.121403
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., and Borzenets, I. V. Tue .
"Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor". United States. https://doi.org/10.1103/physrevb.100.121403. https://www.osti.gov/servlets/purl/1737512.
@article{osti_1737512,
title = {Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor},
author = {Wei, M. T. and Draelos, A. W. and Seredinski, A. and Ke, C. T. and Li, H. and Mehta, Y. and Watanabe, K. and Taniguchi, T. and Yamamoto, M. and Tarucha, S. and Finkelstein, G. and Amet, F. and Borzenets, I. V.},
abstractNote = {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.},
doi = {10.1103/physrevb.100.121403},
journal = {Physical Review B},
number = 12,
volume = 100,
place = {United States},
year = {Tue Sep 10 00:00:00 EDT 2019},
month = {Tue Sep 10 00:00:00 EDT 2019}
}
Web of Science
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