Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.
Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.
Phys Rev Lett. 2023 Jan 27;130(4):043201. doi: 10.1103/PhysRevLett.130.043201.
The Floquet engineering opens the way to create new topological states without counterparts in static systems. Here, we report the experimental realization and characterization of new anomalous topological states with high-precision Floquet engineering for ultracold atoms trapped in a shaking optical Raman lattice. The Floquet band topology is manipulated by tuning the driving-induced band crossings referred to as band inversion surfaces (BISs), whose configurations fully characterize the topology of the underlying states. We uncover various exotic anomalous topological states by measuring the configurations of BISs that correspond to the bulk Floquet topology. In particular, we identify an unprecedented anomalous Floquet valley-Hall state that possesses anomalous helical-like edge modes protected by valleys and a chiral state with high Chern number.
Floquet 工程开辟了在静态系统中创造没有对应物的新拓扑状态的途径。在这里，我们报告了使用高精度 Floquet 工程实现和表征新的异常拓扑状态的实验结果，该状态用于捕获在振动光学喇曼晶格中的超冷原子。通过调整驱动诱导的能带交叉（称为能带反转表面，BIS）来操纵 Floquet 能带拓扑，其配置完全描述了基础状态的拓扑。我们通过测量对应于体 Floquet 拓扑的 BIS 配置，揭示了各种奇异异常拓扑状态。特别地，我们确定了一种前所未有的异常 Floquet 谷霍尔态，它具有由谷保护的异常螺旋状边缘模式和具有高陈数的手性态。
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