论文标题
非中心对称晶体中的纯自旋光电流：散装自旋光伏效应
Pure Spin Photocurrent in Non-centrosymmetric Crystals: Bulk Spin Photovoltaic Effect
论文作者
论文摘要
旋转电流发生器是基于自旋的信息处理的关键组件。在这项工作中，我们从理论和计算上研究了在光照射下创建直流旋转电流的大量自旋光伏（BSPV）效果。 BPSV的唯一要求是反转对称性破裂，因此它适用于广泛的材料，并且可以与现有的半导体技术相结合。 BSPV效应是大量光伏（BPV）效应的表弟，从而在光下生成DC电荷电流。多亏了自旋和电荷电流的不同选择规则，如果系统具有镜面对称性或反转晶格对称性，则可以实现纯自旋电流。 BPSV的机制和电子放松时间$τ$的作用也被阐明。我们将理论应用于几种不同的材料系统，包括过渡金属二核苷，抗铁磁性$ \ rm mnbi_2te_4 $以及拓扑结晶绝缘子立方体$ \ rm rm snte $。
Spin current generators are critical components for spintronics-based information processing. In this work, we theoretically and computationally investigate the bulk spin photovoltaic (BSPV) effect for creating DC spin current under light illumination. The only requirement for BPSV is inversion symmetry breaking, thus it applies to a broad range of materials and can be readily integrated with existing semiconductor technologies. The BSPV effect is a cousin of the bulk photovoltaic (BPV) effect, whereby a DC charge current is generated under light. Thanks to the different selection rules on spin and charge currents, a pure spin current can be realized if the system possesses mirror symmetry or inversion-mirror symmetry. The mechanism of BPSV and the role of the electronic relaxation time $τ$ are also elucidated. We apply our theory to several distinct material systems, including transition metal dichalcogenides, anti-ferromagnetic $\rm MnBi_2Te_4$, and the surface of topological crystalline insulator cubic $\rm SnTe$.
