Publikation: Large Quantum Fluctuations in Planar Josephson Junctions
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Datum
2022
Autor:innen
Haxell, Daniel Z.
Cheah, Erik
Křížek, Filip
Schott, Rüdiger
Hinderling, Manuel
Bruder, Christoph
Wegscheider, Werner
Riel, Heike
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Zusammenfassung
We investigate the stochastic phase dynamics of planar Josephson junctions (JJs) and superconducting quantum interference devices (SQUIDs) defined in epitaxial InAs/Al heterostructures. The interplay of large quantum fluctuations and phase diffusion results in an intriguing regime where the mean switching current of a JJ is a small fraction of the critical current and macroscopic quantum tunneling is the most relevant switching mechanism up to the critical temperature. Phase locking between two JJs further modifies the phase dynamics, resulting in a different switching current between that of a JJ measured in isolation and that of the same JJ measured in an asymmetric SQUID loop. The relative contribution of quantum tunneling and phase diffusion is further tuned by a magnetic flux in the SQUID loop.
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530 Physik
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Planar Josephson junctions (JJs), superconducting quantum interference devices (SQUIDs)
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HAXELL, Daniel Z., Erik CHEAH, Filip KŘÍŽEK, Rüdiger SCHOTT, Markus F. RITTER, Manuel HINDERLING, Wolfgang BELZIG, Christoph BRUDER, Werner WEGSCHEIDER, Heike RIEL, Fabrizio NICHELE, 2022. Large Quantum Fluctuations in Planar Josephson JunctionsBibTex
@unpublished{Haxell2022-04-12T08:27:09ZLarge-57934,
year={2022},
title={Large Quantum Fluctuations in Planar Josephson Junctions},
author={Haxell, Daniel Z. and Cheah, Erik and Křížek, Filip and Schott, Rüdiger and Ritter, Markus F. and Hinderling, Manuel and Belzig, Wolfgang and Bruder, Christoph and Wegscheider, Werner and Riel, Heike and Nichele, Fabrizio}
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<dcterms:abstract xml:lang="eng">We investigate the stochastic phase dynamics of planar Josephson junctions (JJs) and superconducting quantum interference devices (SQUIDs) defined in epitaxial InAs/Al heterostructures. The interplay of large quantum fluctuations and phase diffusion results in an intriguing regime where the mean switching current of a JJ is a small fraction of the critical current and macroscopic quantum tunneling is the most relevant switching mechanism up to the critical temperature. Phase locking between two JJs further modifies the phase dynamics, resulting in a different switching current between that of a JJ measured in isolation and that of the same JJ measured in an asymmetric SQUID loop. The relative contribution of quantum tunneling and phase diffusion is further tuned by a magnetic flux in the SQUID loop.</dcterms:abstract>
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