论文标题
部分可观测时空混沌系统的无模型预测
Light-induced phase crossovers in a quantum spin Hall system
论文作者
论文摘要
在这项工作中，我们从理论上研究了带有高频泵送光学的范式量子旋转大厅（QSH）系统中光诱导的拓扑阶段和有限大小的跨界车。以HGTE量子为例，我们的数值结果表明，循环极化的光可以打破时间反转对称性并诱导量子异常霍尔（QAH）相。特别是，边缘状态之间的耦合是自旋依赖性的，不仅与系统的大小有关，而且与偏振光光学元件的强度有关。通过调整两个参数（系统宽度和光泵强度），我们获得了四个传输方式，即QSH，QAH，边缘导电和正常绝缘体。这四个不同的运输方式具有对比的边缘传导性能，这将在各种拓扑材料上的运输实验中显着。
In this work, we theoretically investigate the light-induced topological phases and finite-size crossovers in a paradigmatic quantum spin Hall (QSH) system with high-frequency pumping optics. Taking the HgTe quantum well for an example, our numerical results show that circularly polarized light can break time-reversal symmetry and induce the quantum anomalous Hall (QAH) phase. In particular, the coupling between the edge states is spin dependent and is related not only to the size of the system, but also to the strength of the polarized pumping optics. By tuning the two parameters (system width and optical pumping strength), we obtain four transport regimes, namely, QSH, QAH, edge conducting, and normal insulator. These four different transport regimes have contrasting edge conducting properties, which will feature prominently in transport experiments on various topological materials.
