论文标题
二维三角晶体中的异常平面大厅效应
Anomalous Planar Hall Effect in Two-Dimensional Trigonal Crystals
论文作者
论文摘要
平面霍尔效应（PHE）是在存在共面电场和磁场的情况下平面横向电压的外观。它的标志是一种特征性的$π$周期性，即，即使在磁场逆转，角度依赖性下，横向电压在对齐时完全消失了横向电压。在这里，我们证明，在二维三角晶体中，Zeeman诱导的非平凡浆果曲率效应产生了先前未知的异常PHE，在磁场中是奇怪的，并且与驱动电场的相对角度无关。我们进一步表明，当额外的镜像迫使横向电压在线性响应状态下消失时，异常的PHE可以作为二阶响应在零和两倍的频率上作为二阶响应发生。我们证明，这种非线性PHE具有反对称量子的贡献，该量子来自Zeeman诱导的浆果曲率偶极子。
The planar Hall effect (PHE) is the appearance of an in-plane transverse voltage in the presence of coplanar electric and magnetic fields. Its hallmark is a characteristic $π$-periodic, i.e. even under a magnetic field reversal, angular dependence with the transverse voltage that exactly vanishes when the electric and magnetic fields are aligned. Here we demonstrate that in two-dimensional trigonal crystals Zeeman-induced non-trivial Berry curvature effects yield a previously unknown anomalous PHE that is odd in the magnetic field and independent of the relative angle with the driving electric field. We further show that when an additional mirror symmetry forces the transverse voltage to vanish in the linear response regime, the anomalous PHE can occur as a second-order response at both zero and twice the frequency of the applied electric field. We demonstrate that this non-linear PHE possesses an antisymmetric quantum contribution that originates from a Zeeman-induced Berry curvature dipole.
