Time-Reversal-Even Nonlinear Current Induced Spin Polarization
Journal
Physical review letters
Journal Volume
130
Journal Issue
16
Date Issued
2023-04-21
Author(s)
Xiao, Cong
Wu, Weikang
Wang, Hui
Huang, Yue-Xin
Feng, Xiaolong
Liu, Huiying
Niu, Qian
Yang, Shengyuan A
Abstract
We propose a time-reversal-even spin generation in second order of electric fields, which dominates the current induced spin polarization in a wide class of centrosymmetric nonmagnetic materials, and leads to a novel nonlinear spin-orbit torque in magnets. We reveal a quantum origin of this effect from the momentum space dipole of the anomalous spin polarizability. First-principles calculations predict sizable spin generations in several nonmagnetic hcp metals, in monolayer TiTe_{2}, and in ferromagnetic monolayer MnSe_{2}, which can be detected in experiment. Our work opens up the broad vista of nonlinear spintronics in both nonmagnetic and magnetic systems.
Subjects
Physics - Mesoscopic Systems and Quantum Hall Effect; Physics - Mesoscopic Systems and Quantum Hall Effect
Description
4 pages, 2 figures
Type
journal article