论文标题
超导体传播器约瑟夫森连接处的介观波动
Mesoscopic fluctuations in superconductor-topological insulator Josephson junctions
论文作者
论文摘要
我们研究了由约瑟夫森连接的超电流中的介观波动，该连接由两个常规超导体之间的拓扑绝缘子微桥组成。在模型中，当超导体引起表面状态光谱的间隙以及磁场刺穿引起depairing和间隙填充的连接区域时，我们说明了强度的邻近效应。约瑟夫森电流波动的整体幅度和功能形式是分析确定的，并发现敏感地依赖于表面状态的耦合强度，无用的能量和对问题的破坏能量尺度。我们还研究了可以通过扫描探针来测量的状态密度。从技术上讲，拓扑区域中接近度效应的平均场描述的介观波是通过现场理论方法来描述的，即扩展对称性分类的D类中的副本非线性$σ$ -Model。
We study mesoscopic fluctuations in the supercurrent of a Josephson junction consisting of a topological insulator microbridge between two conventional superconductors. In the model, we account for the strong proximity effect when superconductors induce a gap in the spectrum of surface states as well as a magnetic field piercing the junction area that causes depairing and gap filling. The overall magnitude and functional form of the Josephson current fluctuations are determined analytically, and found to sensitively depend on the coupling strength to surface states, Thouless energy, and pair-breaking energy scales in the problem. We also study the density of states that can be measured by scanning probes. Technically, mesoscopic fluctuations on top of the mean field description of the proximity effect in the topological region are described by a field theory approach, the replica nonlinear $σ$-model in the class-D of the extended symmetry classification.
