Department of physics, Jiangsu University, Zhenjiang, 212013, China.
Department of Physics, Yancheng Institute of Technology, Yancheng, 224051, China.
Sci Rep. 2018 Feb 2;8(1):2243. doi: 10.1038/s41598-018-20604-w.
We propose a simple approach to realize two-dimensional Floquet topological superfluid by periodically tuning the depth of square optical lattice potentials. We show that the periodic driving can induce topological phase transitions between trivial superfluid and Floquet topological superfluid. For this systems we verify the anomalous bulk-boundary correspondence, namely that the robust chiral Floquet edge states can appear even when the winding number of all the bulk Floquet bands is zero. We establish the existence of two Floquet Majorana zero modes separated in the quasienergy space, with ε = 0,π/T at the topological defects.
我们提出了一种简单的方法，通过周期性地调节正方形光晶格势的深度来实现二维 Floquet 拓扑超流。我们表明，周期性驱动可以诱导平凡超流和 Floquet 拓扑超流之间的拓扑相变。对于这个系统，我们验证了反常的体边对应关系，即即使所有体 Floquet 能带的拓扑涡度数都为零，也会出现稳健的手征 Floquet 边态。我们在准能空间中建立了两个 Floquet Majorana 零模的存在，其在拓扑缺陷处的 ε = 0，π/T。
