论文标题
非线性异常霍尔效应探针拓扑相转换在扭曲的双双层石墨烯中
Nonlinear anomalous Hall effects probe topological phase-transitions in twisted double bilayer graphene
论文作者
论文摘要
非线性异常霍尔效应是浆果曲率偶极子诱导的二阶霍尔电压或温度差异，以响应纵向电场或温度梯度。这些是时间逆转对称系统中突出的大厅响应。在这里，我们研究了二阶非线性异常霍尔效应的家族，在扭曲的双双层石墨烯的Moiré系统中，电气，热电和热非线性霍尔效应。我们证明，非线性异常大厅信号可用于探测由垂直电场诱导的Moiré系统中的拓扑相变。具体而言，我们表明，整个非线性异常大厅的反应都会在拓扑相传输中发生逆转标志。
Nonlinear anomalous Hall effect is the Berry curvature dipole induced second-order Hall voltage or temperature difference in response to a longitudinal electric field or temperature gradient. These are the prominent Hall responses in time reversal symmetric systems. Here, we investigate the family of second-order nonlinear anomalous Hall effects, the electrical, thermoelectric and thermal nonlinear Hall effects in the moiré system of twisted double bilayer graphene. We demonstrate that the nonlinear anomalous Hall signals can be used to probe the topological phase-transitions in moiré systems, induced by a perpendicular electric field. Specifically, we show that the whole family of nonlinear anomalous Hall responses undergo a sign reversal across a topological phase-transition.
