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arXiv 2210.01037cond-mat.supr-con
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平面非中心对称超导器件中的反常约瑟夫森效应

Anomalous Josephson effect in planar noncentrosymmetric superconducting devices

Jaglul Hasan, Konstantin N. Nesterov, Songci Li, Manuel Houzet, Julia S. Meyer, Alex Levchenko

摘要:

在具有破缺反转和时间反转对称性的二维电子系统中,约瑟夫森结揭示了一种反常的响应:即使两个超导体之间的相位差为零,超导电流也不为零。我们考虑这种特殊现象的细节在平面双势垒配置的混合电路,其中的非中心对称正常区域的自旋-轨道耦合的范式Rashba模型的条款。我们分析了这种反常的约瑟夫森效应的Ginzburg-Landau形式主义和微观格林函数的方法在干净的限制。临界电流的大小计算为一个任意的面内磁场取向,并在约瑟夫森电流-相位关系的异常相移确定在几个极限情况下的模型的参数。

英文摘要:

In two-dimensional electron systems with broken inversion and time-reversal symmetries, a Josephson junction reveals an anomalous response: the supercurrent is nonzero even at zero phase difference between two superconductors. We consider details of this peculiar phenomenon in the planar double-barrier configurations of hybrid circuits, where the noncentrosymmetric normal region is described in terms of the paradigmatic Rashba model of spin-orbit coupling. We analyze this anomalous Josephson effect by means of both the Ginzburg-Landau formalism and the microscopic Green's functions approach in the clean limit. The magnitude of the critical current is calculated for an arbitrary in-plane magnetic field orientation, and anomalous phase shifts in the Josephson current-phase relation are determined in terms of the parameters of the model in several limiting cases.

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