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Time-Reversal-Even Nonlinear Current Induced Spin Polarization

Year: 2023
Type: article
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.
DOI: 10.1103/physrevlett.130.166302
Authors: Cong Xiao, Weikang Wu, Hui Wang, Yue-Xin Huang, Xiaolong Feng, Huiying Liu, Guang-Yu Guo, Qian Niu, Shengyuan A. Yang
Institutions: University of Hong Kong, Shandong University, Singapore University of Technology and Design, Beihang University, National Taiwan University, National Center for Theoretical Sciences, Physics Division, University of Science and Technology of China
Language: English
Open Access status: green
OpenAlex ID: W4366681631
FWCI: 5.726
Cites: 74
Cited by: 50
Related to: 10