Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions.
Abstract
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.
Type
Journal articleSubject
AC Josephson EffectDriven−Dissipative Systems
Shapiro Steps
Superconductivity
Topological Materials
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https://hdl.handle.net/10161/21903Published Version (Please cite this version)
10.1021/acs.nanolett.0c01598Publication Info
Larson, Trevyn FQ; Zhao, Lingfei; Arnault, Ethan G; Wei, Ming-Tso; Seredinski, Andrew;
Li, Henming; ... Finkelstein, Gleb (2020). Zero Crossing Steps and Anomalous Shapiro Maps in Graphene Josephson Junctions. Nano letters, 20(10). pp. 6998-7003. 10.1021/acs.nanolett.0c01598. Retrieved from https://hdl.handle.net/10161/21903.This is constructed from limited available data and may be imprecise. To cite this
article, please review & use the official citation provided by the journal.
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Show full item recordScholars@Duke
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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