Zeeman-Effect-Induced 0-π Transitions in Ballistic Dirac Semimetal Josephson Junctions
| Autor: | Yingkai Huang, Chuan Li, Bob de Ronde, Alexander Brinkman, Floris A. Zwanenburg, Alexander A. Golubov, Joost Ridderbos, Jorrit Cornelis de Boer |
|---|---|
| Přispěvatelé: | Hard Condensed Matter (WZI, IoP, FNWI), Interfaces and Correlated Electron Systems |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Josephson effect Zeeman effect Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Field (physics) Condensed Matter - Superconductivity Dirac (video compression format) General Physics and Astronomy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences law.invention SQUID Momentum symbols.namesake Ferromagnetism law Condensed Matter::Superconductivity 0103 physical sciences symbols Cooper pair 010306 general physics |
| Zdroj: | Physical Review Letters, 123(2):026802. American Physical Society Physical review letters, 123(2):026802. American Physical Society |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | One of the consequences of Cooper pairs having a finite momentum in the interlayer of a Josephson junction is $\ensuremath{\pi}$-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 $0\text{\ensuremath{-}}\ensuremath{\pi}$ transitions in ${\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{Sb}}_{x}$, three-dimensional Dirac semimetal-based Josephson junctions. The large in-plane $g$ factor allows tuning of the Josephson junctions from 0 to $\ensuremath{\pi}$ regimes. This is revealed by measuring a $\ensuremath{\pi}$ 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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