论文标题
无序超导体的通用电压波动
Universal Voltage Fluctuations in Disordered Superconductors
论文作者
论文摘要
Aharonov-Casher效应是适用于携带磁矩的中性颗粒的Aharonov-bohm效应的类似物。 这可以通过旋转或插入电荷的轨迹中的涡流或磁通量来表现。这些预测这些会导致持续的电压，从而为不同的样品实现而波动。在这里，我们表明，无序的超导体表现出可再现的电压波动，相对于磁场的反对称性，这是各种参数的函数，例如磁场振幅，磁场方向和栅极电压。这些结果被解释为涡旋等同于介质无序金属系统典型的通用电导波动。我们分析了随机矩阵理论框架中的数据，并表明波动相关函数和曲率分布表现出行为，这是Aronov-Casher物理学的指纹。结果证明了高于$ t_c $的高度无序超导体中涡流的量子性质。
The Aharonov-Casher effect is the analogue of the Aharonov-Bohm effect that applies to neutral particles carrying a magnetic moment. This can be manifested by vortices or fluxons flowing in trajectories that encompass an electric charge. These have been predicted to result in a persistent voltage which fluctuates for different sample realizations. Here we show that disordered superconductors exhibit reproducible voltage fluctuation, antisymmetrical with respect to magnetic field, as a function of various parameters such as magnetic field amplitude, field orientations and gate voltage. These results are interpreted as the vortex equivalent of the universal conductance fluctuations typical of mesoscopic disordered metallic systems. We analyze the data in the framework of random matrix theory and show that the fluctuation correlation functions and curvature distributions exhibit behavior which is the fingerprint of Aronov-Casher physics. The results demonstrate the quantum nature of the vortices in highly disordered superconductors both above and below $T_c$.
