期刊
PHYSICAL REVIEW B
卷 92, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.035428
关键词
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资金
- Visiting Scientist Program of the Centre de Physique Theorique de Grenoble-Alpes (CPTGA)
- FIRB project HybridNanoDev [RBFR1236VV]
- ANR [ANR-11-JS04-003-01, ANR-12-BS04-0016-03]
- EU-FP7 Marie Curie IRG
We study the effect of amagnetic field on the current-phase relation of a topological Josephson junction formed by connecting two superconductors through the helical edge states of a quantum spin-Hall insulator. We predict that the Zeeman effect along the spin quantization axis of the helical edges results in an anomalous Josephson relation that allows for a supercurrent to flow in the absence of superconducting phase bias. We relate the associated field-tunable phase shift phi(0) in the Josephson relation of such a phi(0) junction to the existence of a so-called helical superconductivity, which may result from the interplay of the Zeeman effect and spin-orbit coupling. We analyze the dependence of the magneto-supercurrent on the junction length and discuss its observability in suitably designed hybrid structures subject to an in-plane magnetic field.
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