Time-Reversal-Even Nonlinear Current Induced Spin Polarization

作     者：Xiao, Cong Wu, Weikang Wang, Hui Huang, Yue-Xin Feng, Xiaolong Liu, Huiying Guo, Guang-Yu Niu, Qian Yang, Shengyuan A. 

作者机构：Department of Physics The University of Hong Kong Hong Kong HKU-UCAS Joint Institute of Theoretical and Computational Physics Hong Kong Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore487372 Singapore Department of Physics National Taiwan University Taipei10617 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan School of Physics University of Science and Technology of China Anhui Hefei230026 China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2022年

核心收录：

主　　题：Spin polarization 

摘      要：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 TiTe2, and in ferromagnetic monolayer MnSe2, which can be detected in experiment. Our work opens up the broad vista of nonlinear spintronics in both nonmagnetic and magnetic systems. © 2022, CC BY.