论文标题
平面非中心超导器件中的约瑟夫森效应异常
Anomalous Josephson effect in planar noncentrosymmetric superconducting devices
论文作者
论文摘要
在二维电子系统中，反转和时反转对称性损坏，约瑟夫森连接揭示了异常的响应：两个超导体之间的零相差，超电流也非零。我们考虑了混合电路的平面双屏障构型中这种特殊现象的细节，其中用自旋轨道耦合的范式RashBA模型描述了非中心对称正常区域。我们通过Ginzburg-Landau形式主义和微观绿色的功能方法在清洁极限中分析了这种异常的约瑟夫森效应。计算针对任意面内磁场方向的临界电流的大小，并在几种限制情况下根据模型的参数确定约瑟夫森电流相关关系的异常相移。
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.
