Xu Luting, Li Xin-Qi, Sun Qing-Feng
Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, People's Republic of China.
J Phys Condens Matter. 2017 May 17;29(19):195301. doi: 10.1088/1361-648X/aa6661. Epub 2017 Mar 13.
The Josephson supercurrent through a hybrid Majorana-quantum dot-Majorana junction is investigated. We particularly analyze the effect of spin-selective coupling between the Majorana and quantum dot states, which only emerges in the topological phase and will influence the current through bent junctions and/or in the presence of magnetic fields in the quantum dot. We find that the characteristic behavior of the supercurrent through this system is quite counterintuitive, differing remarkably from the resonant tunneling, e.g. through the similar (normal phase) superconductor-quantum dot-superconductor junction. Our analysis is carried out under the influence of the full set-up parameters and for both the [Formula: see text] and [Formula: see text] periodic currents. The present study is expected to be relevant to the future exploration of applications of Majorana-nanowire circuits.
研究了通过混合马约拉纳量子点 - 马约拉纳结的约瑟夫森超电流。我们特别分析了马约拉纳态与量子点态之间自旋选择性耦合的影响，这种耦合仅出现在拓扑相中，并且会影响通过弯曲结的电流和/或在量子点存在磁场的情况下的电流。我们发现，通过该系统的超电流的特征行为非常违反直觉，与共振隧穿有显著不同，例如通过类似的（正常相）超导体 - 量子点 - 超导体结。我们的分析是在全套参数的影响下，针对(I = I_0\sin(\omega t))和(I = I_0\cos(\omega t))这两种周期性电流进行的。本研究有望与未来对马约拉纳纳米线电路应用的探索相关。
