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Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions.

Publication ,  Journal Article
Larson, TFQ; Zhao, L; Arnault, EG; Wei, M-T; Seredinski, A; Li, H; Watanabe, K; Taniguchi, T; Amet, F; Finkelstein, G
Published in: Nano letters
October 2020

The AC Josephson effect manifests itself in the form of "Shapiro steps" of quantized voltage in Josephson junctions subject to radiofrequency (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.

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Published In

Nano letters

DOI

EISSN

1530-6992

ISSN

1530-6984

Publication Date

October 2020

Volume

20

Issue

10

Start / End Page

6998 / 7003

Related Subject Headings

  • Nanoscience & Nanotechnology
 

Citation

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MLA
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Larson, T. F. Q., Zhao, L., Arnault, E. G., Wei, M.-T., Seredinski, A., Li, H., … Finkelstein, G. (2020). Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions. Nano Letters, 20(10), 6998–7003. https://doi.org/10.1021/acs.nanolett.0c01598
Larson, Trevyn F. Q., Lingfei Zhao, Ethan G. Arnault, Ming-Tso Wei, Andrew Seredinski, Henming Li, Kenji Watanabe, Takashi Taniguchi, François Amet, and Gleb Finkelstein. “Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions.Nano Letters 20, no. 10 (October 2020): 6998–7003. https://doi.org/10.1021/acs.nanolett.0c01598.
Larson TFQ, Zhao L, Arnault EG, Wei M-T, Seredinski A, Li H, et al. Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions. Nano letters. 2020 Oct;20(10):6998–7003.
Larson, Trevyn F. Q., et al. “Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions.Nano Letters, vol. 20, no. 10, Oct. 2020, pp. 6998–7003. Epmc, doi:10.1021/acs.nanolett.0c01598.
Larson TFQ, Zhao L, Arnault EG, Wei M-T, Seredinski A, Li H, Watanabe K, Taniguchi T, Amet F, Finkelstein G. Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions. Nano letters. 2020 Oct;20(10):6998–7003.
Journal cover image

Published In

Nano letters

DOI

EISSN

1530-6992

ISSN

1530-6984

Publication Date

October 2020

Volume

20

Issue

10

Start / End Page

6998 / 7003

Related Subject Headings

  • Nanoscience & Nanotechnology