期刊
PHYSICAL REVIEW LETTERS
卷 119, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.187704
关键词
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资金
- European Research Council
- Netherlands Organization for Scientific Research (NWO)
- Foundation for Fundamental Research on Matter (FOM)
- Microsoft Corporation Station
- Niels Stensen Fellowship
- NSF [PHY11-25915, DMR-125296]
- NSERC
- CIFAR
- Max Planck-UBC Centre for Quantum Materials
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1252962] Funding Source: National Science Foundation
Junctions created by coupling two superconductors via a semiconductor nanowire in the presence of high magnetic fields are the basis for the potential detection, fusion, and braiding of Majorana bound states. We study NbTiN/InSb nanowire/NbTiN Josephson junctions and find that the dependence of the critical current on the magnetic field exhibits gate-tunable nodes. This is in contrast with a well-known Fraunhofer effect, under which critical current nodes form a regular pattern with a period fixed by the junction area. Based on a realistic numerical model we conclude that the Zeeman effect induced by the magnetic field and the spin-orbit interaction in the nanowire are insufficient to explain the observed evolution of the Josephson effect. We find the interference between the few occupied one-dimensional modes in the nanowire to be the dominant mechanism responsible for the critical current behavior. We also report a strong suppression of critical currents at finite magnetic fields that should be taken into account when designing circuits based on Majorana bound states.
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