arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.01949cond-mat.mes-hall
收藏

拓扑约瑟夫森$ϕ_0$结

Topological Josephson $ϕ_0$-junctions

Fabrizio Dolcini, Manuel Houzet, Julia S. Meyer

摘要:

本文研究了磁场对两个超导体通过量子自旋霍尔绝缘体的螺旋边态连接而成的拓扑约瑟夫森结的电流-相位关系的影响。我们预测,塞曼效应沿自旋量子化轴的螺旋边缘的结果在一个异常的约瑟夫森关系,允许超导相偏置的情况下,流动的超导电流。我们将这种$ϕ_0$结的约瑟夫森关系中的相关场可调相移$ϕ_0$与所谓的螺旋超导的存在联系起来,这种螺旋超导可能是塞曼效应和自旋轨道耦合相互作用的结果。我们分析了磁超电流对结长的依赖关系,并讨论了在面内磁场作用下,在适当设计的混合结构中磁超电流的可观测性。

英文摘要:

We study the effect of a magnetic 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 $ϕ_0$ in the Josephson relation of such a $ϕ_0$-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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑