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

doi:10.1103/PhysRevLett.123.026802

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

^*Corresponding author for this work

Interfaces and Correlated Electron Systems

Research output: Contribution to journal › Article › Academic › peer-review

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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 language	English
Article number	026802
Journal	Physical review letters
Volume	123
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.123.026802
Publication status	Published - 9 Jul 2019

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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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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

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

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