论文标题
量子厅边缘状态在周期性驾驶下：浮标引起的手性开关
Quantum Hall edge states under periodic driving: a Floquet induced chirality switch
论文作者
论文摘要
我们报告了在强激光照明下石墨烯中量子厅效应的命运。通过使用Floquet理论与低能量描述和完整的紧密结合模型相结合，我们阐明了选择规则，准材料带结构，以及它们与设备设置中的两端和多末端电导的联系，这与实验相关。我们表明，在$ \ pm \，\hbarΩ/2 $上出现在Floquet Spectrum中出现的众所周知的动力学差距导致量子厅边缘传输的关闭，用于不同的边缘终端，除了扶手椅ONE，其中两个术语完全取消。更有趣的是，我们表明，在狄拉克点附近改变激光极化（圆向右或圆形）可以通过允许打开或关闭尺寸，甚至通过翻转符号来控制霍尔电导，从而逆转边缘状态的手性。这可能会导致新的途径完全控制拓扑保护的运输。
We report on the fate of the quantum Hall effect in graphene under strong laser illumination. By using Floquet theory combined with both a low energy description and full tight-binding models, we clarify the selection rules, the quasienergy band structure, as well as their connection with the two-terminal and multi-terminal conductance in a device setup as relevant for experiments. We show that the well-known dynamical gaps that appear in the Floquet spectrum at $\pm\,\hbarΩ/2$ lead to a switch-off of the quantum Hall edge transport for different edge terminations except for the armchair one, where two terms cancel out exactly. More interestingly, we show that near the Dirac point changing the laser polarization (circular right or circular left) controls the Hall conductance, by allowing to switch it on or off, or even by flipping its sign, thereby reversing the chirality of the edge states. This might lead to new avenues to fully control topologically protected transport.
