论文标题
边缘状态的超导量子干扰约瑟夫森连接
Superconducting Quantum Interference in Edge State Josephson Junctions
论文作者
论文摘要
我们研究了在二维（2D）绝缘子中通过边缘状态链接的约瑟夫森连接中的超导量子干扰。我们考虑了两种情况，其中2D绝缘子是支撑一维（1D）螺旋或非螺旋边缘状态的拓扑或琐碎的绝缘子。在平衡中，我们发现临界超流对通过结的通量的定性依赖性对中介状态的螺旋性不敏感，因此不能用于验证基础绝缘子的拓扑特征。但是，在将有限的电压偏置应用于相对较长的连接时，与非螺旋边缘状态相比，非平衡运输电流的有限频率干扰模式在定性上是不同的。
We study superconducting quantum interference in a Josephson junction linked via edge states in two-dimensional (2D) insulators. We consider two scenarios in which the 2D insulator is either a topological or a trivial insulator supporting one-dimensional (1D) helical or nonhelical edge states, respectively. In equilibrium, we find that the qualitative dependence of critical supercurrent on the flux through the junction is insensitive to the helical nature of the mediating states and can, therefore, not be used to verify the topological features of the underlying insulator. However, upon applying a finite voltage bias smaller than the superconducting gap to a relatively long junction, the finite-frequency interference pattern in the non-equilibrium transport current is qualitatively different for helical edge states as compared to nonhelical ones.
