论文标题
非对称超导纳米线环的量子干扰
Quantum interference in asymmetric superconducting nanowire loops
论文作者
论文摘要
超导体中的宏观相位相干性可以在逼真的设备长度尺度下进行量子干扰和相处。许多超导电子设备基于超导回路中超电流的调制。虽然已经研究了对称超导回路的总体行为，但这种设备中不对称的影响仍然不足且了解不足。在这里，我们报告了一项实验和理论研究，该研究对持久电流的通量调制在双连接的不对称铝纳米线环中。循环中考虑长度和电子横截面不对称的模型提供了观测值的定量描述。与实验的比较提供了必不可少的参数，例如持久和临界电流以及可以为超导量子设备设计提供反馈的不对称量。
Macroscopic phase coherence in superconductors enables quantum interference and phase manipulation at realistic device length scales. Numerous superconducting electronic devices are based on the modulation of the supercurrent in superconducting loops. While the overall behavior of symmetric superconducting loops have been studied, the effects of asymmetries in such devices remain under-explored and poorly understood. Here we report on an experimental and theoretical study of the flux modulation of the persistent current in a doubly-connected asymmetric aluminum nanowire loop. A model considering the length and electronic cross-section asymmetries in the loop provides a quantitative account of the observations. Comparison with experiments give essential parameters such as persistent and critical currents as well as the amount of asymmetry which can provide feedback into the design of superconducting quantum devices.
