论文标题
Moiré过渡金属二甲基元化杂质质的浆果曲率，自旋大厅效应和非线性光学响应
Berry curvature, spin Hall effect and nonlinear optical response in moiré transition metal dichalcogenide heterobilayers
论文作者
论文摘要
最近，在AB堆放的MOTE $ _2 $/WSE $ _2 $异质结构中观察到了拓扑平面和旋转厅效应。在这项工作中，我们系统地研究了Moiré过渡金属二甲元基（TMD）异叶杂种者中的浆果曲率效应。我们指出，远程传导带的Moiré电位将在价带上引起相当大的周期性伪磁场（PMF）。该周期性PMF在MoiréBrillouin区域的每个山谷中产生净浆果曲率通量。浆果曲率的效果与自旋谷锁定的效果的结合可以诱导实验中观察到的自旋霍尔效应。有趣的是，可以通过偏移电流探测由PMF产生的山谷对齐的浆果曲率分布，这是通过非线性响应通过线性极化灯诱导的直流电流。我们的工作使MoiréTMDHeterobilayers中浆果曲率引起的新型量子现象的灯光揭开了灯光。
Recently, the topological flat bands and spin Hall effect have been experimentally observed in the AB-stacked MoTe$_2$/WSe$_2$ heterostructures. In this work, we systematically study the Berry curvature effects in moiré transition metal dichalcogenide (TMD) heterobilayers. We point out that the moiré potential of the remote conduction bands would induce a sizable periodic pseudo-magnetic field (PMF) on the valence band. This periodic PMF creates net Berry curvature flux in each valley of the moiré Brillouin zone. The combination of the effect of the Berry curvature and the spin-valley locking can induce the spin Hall effect being observed in the experiment. Interestingly, the valley-contrasting Berry curvature distribution generated by the PMF can be probed through shift currents, which are DC currents induced by linearly polarized lights through nonlinear responses. Our work shed lights on the novel quantum phenomena induced by Berry curvatures in moiré TMD heterobilayers.
