Xiao, CongCongXiaoWu, WeikangWeikangWuWang, HuiHuiWangHuang, Yue-XinYue-XinHuangFeng, XiaolongXiaolongFengLiu, HuiyingHuiyingLiuGUANG-YU GUONiu, QianQianNiuYang, Shengyuan AShengyuan AYang2023-07-172023-07-172023-04-2100319007https://scholars.lib.ntu.edu.tw/handle/123456789/633834https://www.scopus.com/inward/record.uri?eid=2-s2.0-85153892300&doi=10.1103%2fPhysRevLett.130.166302&partnerID=40&md5=6da1d55760fce29fb55f96e08f9b37224 pages, 2 figuresWe 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.enPhysics - Mesoscopic Systems and Quantum Hall Effect; Physics - Mesoscopic Systems and Quantum Hall Effectjournal article10.1103/PhysRevLett.130.166302371546292-s2.0-85153892300http://arxiv.org/abs/2209.08364v1