论文标题
时间反转 - 甚至非线性电流诱导的自旋极化
Time-Reversal-Even Nonlinear Current Induced Spin Polarization
论文作者
论文摘要
我们提出了电场二阶的时间反转自旋产生，该自旋产生在一系列巨大的中心对称非磁性材料中主导着当前诱导的自旋极化，并导致磁铁中新型的非线性自旋轨道扭矩。我们从异常自旋极化性的动量空间偶极子中揭示了这种作用的量子起源。第一原理计算预测了几种非磁性HCP金属的相当大型旋转世代，单层tite $ _ {2} $，以及在实验中可以检测到的ferromagnetic Monolayer mnse $ _ {2} $。我们的工作打开了非磁性和磁系统中非线性旋转的广泛远景。
We propose a time-reversal-even spin generation in second order of electric fields, which dominates the current induced spin polarization in a wide class of centrosymmetric nonmagnetic materials, and leads to a novel nonlinear spin-orbit torque in magnets. We reveal a quantum origin of this effect from the momentum space dipole of the anomalous spin polarizability. First-principles calculations predict sizable spin generations in several nonmagnetic hcp metals, in monolayer TiTe$_{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.
