论文标题
平均侵略性磁性Weyl半法的非线性手性光电流
Nonlinear chiral photocurrent in parity-violating magnetic Weyl semimetals
论文作者
论文摘要
非平凡带拓扑与磁纹理之间的牢固相关性使磁性Weyl半学以操纵和检测磁化动力学的出色候选物。均衡违规与Pauli阻塞只会导致一个Weyl节点有助于光电流响应，这反过来又影响了由于自旋传递扭矩而引起的磁纹理。利用Landau-lifshitz-gilbert方程和非中心对称的Weyl磁体中的自旋转移扭矩，我们表明手性光电流从易于C轴到A或B轴旋转磁化，从而导致光电流响应旁边的外来电流。手性光电流是在量子动力学理论的背景下计算的，并且在Weyl节点附近的MA/W的顺序上具有很强的共鸣，其大小由动量弛豫时间控制。值得注意的是，我们研究了磁性纹理动力学对拓扑非线性光电流响应的影响，包括移位和注射电流以及新的手性光电流，并表明手性光电流的大小和平面方向都与磁矩的方向密切相关。
The strong correlation between the non-trivial band topology and the magnetic texture makes magnetic Weyl semimetals excellent candidates for the manipulation and detection of magnetization dynamics. The parity violation together with the Pauli blocking cause only one Weyl node to contribute to the photocurrent response, which in turn affects the magnetic texture due to the spin transfer torque. Utilizing the Landau-Lifshitz-Gilbert equation and the spin-transfer torque in non-centrosymmetric Weyl magnets, we show that the chiral photocurrent rotates the magnetization from the easy c axis to the a or b axis, which leads to an exotic current next to the photocurrent response. The chiral photocurrent is calculated in the context of quantum kinetic theory and it has a strong resonance on the order of mA/W near the Weyl nodes, the magnitude of which is controlled by the momentum relaxation time. Remarkably, we study the influence of magnetic texture dynamics on the topological nonlinear photocurrent response, including shift and injection currents along with the new chiral photocurrent, and show that both the magnitude and the in-plane orientation of the chiral photocurrent are strongly correlated with the direction of the magnetic moments.
