Gate-Tunable Josephson Diodes in Magic-Angle Twisted Bilayer Graphene
Nano Letters, vol. 26, pp. 2119–2128
Abstract
We report low-temperature measurements of two adjacent, gate-defined Josephson junctions (JJs) in magic-angle twisted bilayer graphene (MATBG) at a moiré filling factor near ν = -2. We show that both junctions exhibit a prominent, gate-tunable Josephson diode effect, which we explain by a combination of large kinetic inductance and nonuniform supercurrent distribution. Despite their proximity, the JJs display differences in their interference patterns and different diode behaviors, underscoring that microscopic inhomogeneities such as twist angle variations shape the nonuniform supercurrent and drive the diode behavior. As a result, the nonreciprocal supercurrent can be tuned by the gate voltage, enabling tuning of the diode efficiency and even reversing the polarity at fixed magnetic fields. Our findings offer potential routes for tailoring Josephson diode performance in superconducting quantum circuits.
Authors 11
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Forschungszentrum Jülich
JARA-FIT and 2 Institute of Physics
Peter Grünberg Institute (PGI-9)
RWTH Aachen University
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Robin J. Dolleman Aachen
Affiliation as printed
JARA-FIT and 2 Institute of Physics
RWTH Aachen University
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Universität Hamburg · University of Würzburg
Affiliation as printed
Institute for Theoretical Physics and Astrophysics
Institute for Theoretical Physics, University of Hamburg, Notkestraße 9-11, 22607 Hamburg, Germany
University of Würzburg, Am Hubland
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Anthony Achtermann Aachen
Affiliation as printed
JARA-FIT and 2 Institute of Physics
RWTH Aachen University
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Frank Volmer Aachen
Affiliation as printed
JARA-FIT and 2 Institute of Physics
RWTH Aachen University
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National Institute for Materials Science
Affiliation as printed
Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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National Institute for Materials Science
Affiliation as printed
Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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Fabian Hassler Aachen
Affiliation as printed
Institute for Quantum Information
RWTH Aachen University
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Affiliation as printed
Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria
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Bernd Beschoten Aachen
Affiliation as printed
JARA-FIT and 2 Institute of Physics
RWTH Aachen University
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Forschungszentrum Jülich
JARA-FIT and 2 Institute of Physics
Peter Grünberg Institute (PGI-9)
RWTH Aachen University
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