Yang Zhesen, Yang Qinghong, Hu Jiangping, Liu Dong E
Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
Phys Rev Lett. 2021 Feb 26;126(8):086801. doi: 10.1103/PhysRevLett.126.086801.
We study a realistic Floquet topological superconductor, a periodically driven nanowire proximitized to an equilibrium s-wave superconductor. Because of the strong energy and density fluctuations caused by the superconducting proximity effect, the Floquet Majorana wire becomes dissipative. We show that the Floquet band structure is still preserved in this dissipative system. In particular, we find that the Floquet Majorana zero and π modes can no longer be simply described by the Floquet topological band theory. We also propose an effective model to simplify the calculation of the lifetime of these Floquet Majoranas and find that the lifetime can be engineered by the external driving field.
我们研究了一种实际的弗洛凯拓扑超导体，即周期性驱动且与平衡态s波超导体接近的纳米线。由于超导邻近效应引起的强烈能量和密度涨落，弗洛凯马约拉纳线变得具有耗散性。我们表明，在这个耗散系统中弗洛凯能带结构仍然得以保留。特别地，我们发现弗洛凯马约拉纳零模和π模不再能简单地用弗洛凯拓扑能带理论来描述。我们还提出了一个有效模型来简化这些弗洛凯马约拉纳模寿命的计算，并发现寿命可以通过外部驱动场来调控。
