Zeeman-Effect-Induced 0-π Transitions in Ballistic Dirac Semimetal Josephson Junctions

Chuan Li, Bob De Ronde, Jorrit De Boer, Joost Ridderbos, Floris Zwanenburg, Yingkai Huang, Alexander Golubov, Alexander Brinkman

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Abstract

One of the consequences of Cooper pairs having a finite momentum in the interlayer of a Josephson junction is π-junction behavior. The finite momentum can either be due to an exchange field in ferromagnetic Josephson junctions, or due to the Zeeman effect. Here, we report the observation of Zeeman-effect-induced 0-π transitions in Bi1-xSbx, three-dimensional Dirac semimetal-based Josephson junctions. The large in-plane g factor allows tuning of the Josephson junctions from 0 to π regimes. This is revealed by measuring a π phase shift in the current-phase relation measured with an asymmetric superconducting quantum interference device (SQUID). Additionally, we directly measure a nonsinusoidal current-phase relation in the asymmetric SQUID, consistent with models for ballistic Josephson transport.

Original languageEnglish
Article number026802
JournalPhysical review letters
Volume123
Issue number2
DOIs
Publication statusPublished - 9 Jul 2019

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Zeeman effect
metalloids
Josephson junctions
ballistics
momentum
interference
interlayers
phase shift
tuning

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title = "Zeeman-Effect-Induced 0-π Transitions in Ballistic Dirac Semimetal Josephson Junctions",
abstract = "One of the consequences of Cooper pairs having a finite momentum in the interlayer of a Josephson junction is π-junction behavior. The finite momentum can either be due to an exchange field in ferromagnetic Josephson junctions, or due to the Zeeman effect. Here, we report the observation of Zeeman-effect-induced 0-π transitions in Bi1-xSbx, three-dimensional Dirac semimetal-based Josephson junctions. The large in-plane g factor allows tuning of the Josephson junctions from 0 to π regimes. This is revealed by measuring a π phase shift in the current-phase relation measured with an asymmetric superconducting quantum interference device (SQUID). Additionally, we directly measure a nonsinusoidal current-phase relation in the asymmetric SQUID, consistent with models for ballistic Josephson transport.",
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Zeeman-Effect-Induced 0-π Transitions in Ballistic Dirac Semimetal Josephson Junctions. / Li, Chuan; De Ronde, Bob; De Boer, Jorrit; Ridderbos, Joost; Zwanenburg, Floris; Huang, Yingkai; Golubov, Alexander; Brinkman, Alexander.

In: Physical review letters, Vol. 123, No. 2, 026802, 09.07.2019.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Zeeman-Effect-Induced 0-π Transitions in Ballistic Dirac Semimetal Josephson Junctions

AU - Li, Chuan

AU - De Ronde, Bob

AU - De Boer, Jorrit

AU - Ridderbos, Joost

AU - Zwanenburg, Floris

AU - Huang, Yingkai

AU - Golubov, Alexander

AU - Brinkman, Alexander

PY - 2019/7/9

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N2 - One of the consequences of Cooper pairs having a finite momentum in the interlayer of a Josephson junction is π-junction behavior. The finite momentum can either be due to an exchange field in ferromagnetic Josephson junctions, or due to the Zeeman effect. Here, we report the observation of Zeeman-effect-induced 0-π transitions in Bi1-xSbx, three-dimensional Dirac semimetal-based Josephson junctions. The large in-plane g factor allows tuning of the Josephson junctions from 0 to π regimes. This is revealed by measuring a π phase shift in the current-phase relation measured with an asymmetric superconducting quantum interference device (SQUID). Additionally, we directly measure a nonsinusoidal current-phase relation in the asymmetric SQUID, consistent with models for ballistic Josephson transport.

AB - One of the consequences of Cooper pairs having a finite momentum in the interlayer of a Josephson junction is π-junction behavior. The finite momentum can either be due to an exchange field in ferromagnetic Josephson junctions, or due to the Zeeman effect. Here, we report the observation of Zeeman-effect-induced 0-π transitions in Bi1-xSbx, three-dimensional Dirac semimetal-based Josephson junctions. The large in-plane g factor allows tuning of the Josephson junctions from 0 to π regimes. This is revealed by measuring a π phase shift in the current-phase relation measured with an asymmetric superconducting quantum interference device (SQUID). Additionally, we directly measure a nonsinusoidal current-phase relation in the asymmetric SQUID, consistent with models for ballistic Josephson transport.

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