论文标题
扭曲的石墨烯/WSE $ _2 $异质结构中的电荷转换转换
Charge-to-spin conversion in twisted graphene/WSe$_2$ heterostructures
论文作者
论文摘要
我们研究了第一原理中的石墨烯/WSE $ _2 $异构结构中自旋轨道耦合（SOC）接近效应（SOC）接近度效应（SOC）接近度转换（CSC）的扭角依赖性。显示CSC在很大程度上取决于扭曲角度，并在30°扭曲时优化了自旋大厅和标准的Rashba-Edelstein效率。由于扭曲而导致的对称性破裂也会引起非常规的Rashba-Edelstein效应，并产生的非平衡自旋密度具有旋转旋转的旋转，并在施加的电场上。我们进一步讨论了载流子掺杂浓度和带宽的控制费米 - sea和-surface自旋响应之间的交叉，这核对了不同CSC现象的看似不同的实验观察结果。
We investigate the twist angle dependence of spin-orbit coupling (SOC) proximity effects and charge-to-spin conversion (CSC) in graphene/WSe$_2$ heterostructures from first principles. The CSC is shown to strongly depend on the twist angle, with both the spin Hall and standard Rashba-Edelstein efficiencies optimized at or near 30° twisting. Symmetry breaking due to twisting also gives rise to an unconventional Rashba-Edelstein effect, with electrically generated non-equilibrium spin densities possessing spins collinear to the applied electric field. We further discuss how the carrier doping concentration and band broadening control the crossover between the Fermi-sea and -surface spin response, which reconciles the seemingly disparate experimental observations of different CSC phenomena.
