论文标题
带有平坦带的浮雕拓扑系统：边缘模式，浆果曲率和轨道磁化
Floquet topological systems with flat bands: Edge modes, Berry curvature, and Orbital magnetization
论文作者
论文摘要
在两个空间维度中，浮子系统提出了结果，其中Floquet驱动会破坏有效的时间逆转对称性。该驾驶协议还诱导了对应于异常的浮雕阶段的扁平频段，其中Chern号为零，但手性边缘模式存在。边缘模式，浆果曲率和轨道磁化的分析表达式是针对平坦带的。当频带平坦时，还为参数的静态haldane模型提供了结果。表明相同型号的浮子驾驶可导致Chern绝缘子以及异常的浮子阶段。提出了这些不同拓扑阶段的轨道磁化强度，并被发现在半填充的一半填充粒子孔对称性时会增强。
Results are presented for Floquet systems in two spatial dimensions where the Floquet driving breaks an effective time reversal symmetry. The driving protocol also induces flat bands that correspond to anomalous Floquet phases where the Chern number is zero and yet chiral edge modes exist. Analytic expressions for the edge modes, Berry curvature, and the orbital magnetization are derived for the flat bands. Results are also presented for the static Haldane model for parameters when the bands are flat. Floquet driving of the same model is shown to give rise to Chern insulators as well as anomalous Floquet phases. The orbital magnetization for these different topological phases are presented and are found to be enhanced at half filling by the broken particle-hole symmetry of the Haldane model.
