论文标题
电流引起的扭曲双层石墨烯中异常大厅电导的逆转
Current-induced reversal of anomalous Hall conductance in twisted bilayer graphene
论文作者
论文摘要
从实验上观察到，在四倍冷气传导平面带的3/4填充下，在扭曲的双层石墨烯（TBG）中，DC电流可以通过DC电流来翻转大厅电阻的符号。该实验意味着山谷极化（VP）和TBG中拓扑的转换。在这里，我们介绍了有关电流引起的VP和拓扑切换的理论。散装中的电流的存在导致{}在费米能量附近的频段中{electron占用}的重新分布，然后由于库仑相互作用而变形并移动带分散体。在临界电流之上，原始的占领和空带可以交换，从而导致VP和拓扑的切换。
It is observed experimentally that the sign of the Hall resistance can be flipped by a dc electric current in the twisted bilayer graphene (TBG) at 3/4 filling of the four-fold degenerate conduction flat bands. The experiment implies a switching of the valley polarization (VP) and topology in TBG. Here we present a theory on the current-induced switching of VP and topology. The presence of current in the bulk causes {the} redistribution of {electron occupation} in bands near the Fermi energy, which then deforms and shifts the band dispersion due to the Coulomb interaction. Above a critical current, the original occupied and empty bands can be swapped resulting in the switching of VP and topology.
