论文标题
界面增强的螺旋性依赖于金属/半分化双层的光电流
Interface enhanced helicity dependent photocurrent in metal/semimetal bilayers
论文作者
论文摘要
固体中光旋转相互作用的标志之一是光电流的外观取决于光螺旋。最近的研究表明，由于光诱导的旋转电流和半度薄膜的抗旋转大厅效应，螺旋性依赖性光电流（HDP）出现。我们已经研究了金属/半分双层的HDP。与BI单层膜相比，我们发现在金属/BI BiLayers中，HDP增强了。对于双层，HDP的标志背面照明符号从前照明的标志逆转了。在所研究的双层中，背部照明光电流是Ag/bi BiLayer的最大的。使用扩散的自旋传输模型，我们表明背部照明下的HDP标志逆转是由自旋吸收和自旋引起的，以在界面处进行电荷转换。当BI层厚度很小时，这种界面效应有助于双层的前面照明下的HDP增强。这些结果表明，HDP可用于评估具有强旋转轨道耦合的界面状态。
One of the hallmarks of light-spin interaction in solids is the appearance of photocurrent that depends on the light helicity. Recent studies have shown that helicity dependent photocurrent (HDP) emerges due to light induced spin current and the inverse spin Hall effect of semimetal thin films. We have studied HDP in metal/semimetal bilayers. Compared to Bi single layer films, we find the HDP is enhanced in metal/Bi bilayers. For the bilayers, the sign of HDP under back illumination reverses from that of front illumination. The back illumination photocurrent is the largest for Ag/Bi bilayers among the bilayers studied. Using a diffusive spin transport model, we show that the HDP sign reversal under back illumination is caused by spin absorption and spin to charge conversion at the interface. Such interfacial effects contribute to the HDP enhancement under front illumination for the bilayers when the Bi layer thickness is small. These results show that the HDP can be used to assess interface states with strong spin orbit coupling.
