Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions

Larson, Trevyn F. Q.; Zhao, Lingfei; Arnault, Ethan G.; Wei, Ming-Tso; Seredinski, Andrew; Li, Henming; Watanabe, Kenji; Taniguchi, Takashi; Amet, François; Finkelstein, Gleb

doi:10.1021/acs.nanolett.0c01598

Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions

Journal Article · Wed Sep 09 00:00:00 EDT 2020 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.0c01598· OSTI ID:1736009

^[1]; Zhao, Lingfei ^[2]; Arnault, Ethan G. ^[2]; ^[2]; Seredinski, Andrew ^[2]; Li, Henming ^[3]; ^[4]; ^[4]; Amet, François ^[3]; Finkelstein, Gleb ^[2]

Duke Univ., Durham, NC (United States); Duke University
Duke Univ., Durham, NC (United States)
Appalachian State Univ., Boone, NC (United States)
National Inst. for Materials Science, Tsukuba (Japan)

The AC Josephson effect manifests itself in the form of “Shapiro steps” of quantized voltage in Josephson junctions subject to radio frequency (RF) radiation. This effect presents an early example of a driven–dissipative quantum phenomenon and is presently utilized in primary voltage standards. Shapiro steps have also become one of the standard tools to probe junctions made in a variety of novel materials. Here we study Shapiro steps in a widely tunable graphene-based Josephson junction in which the high- frequency dynamics is determined by the on-chip environment. We investigate the variety of patterns that can be obtained in this well-understood system depending on the carrier density, temperature, RF frequency, and magnetic field. Although the patterns of Shapiro steps can change drastically when just one parameter is varied, the overall trends can be understood and the behaviors straightforwardly simulated, showing some key differences from the conventional RCSJ model. The resulting understanding may help interpret similar measurements in more complex materials.

View Accepted Manuscript (DOE)

Research Organization:: Duke Univ., Durham, NC (United States)

Sponsoring Organization:: National Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0002765

OSTI ID:: 1736009

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 10 Vol. 20; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions

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