论文标题
通过多个互动的山谷Zeeman效应的光学控制
Optical control of valley Zeeman effect through many-exciton interactions
论文作者
论文摘要
二维过渡金属二甲化物（TMDS）中的电荷载体（例如WSE $ _2 $）将其旋转和山谷 - 散异，将其锁定在可光化的可调索引中，这是为将来信息处理的基础提出的。该自旋谷指数的操作需要调整其能量，通常是通过外部磁场（B）来调整能量，这很麻烦。因此，需要其他有效的途径，例如自旋谷指数的全光控制。在这里，我们表明，WSE $ _2 $/MOSE $ _2 $ HETEROBILAYER中的层间激子之间的多体相互作用引起了与B $ \ sim $ 6 tesla相对应的稳态山谷Zeeman分裂。这种异常分裂的出现在低至$ $ ws的入射力下，随着功率和增强，抑制甚至翻转B诱导的分裂迹象而增加。此外，$ \ it {g} $ - 山谷Zeeman拆分的因子可以通过$ \ sim $ 30 $ \％$ $ \％$带有事件功率来调节。除了valleytronics外，我们的结果与使用二维材料实现光学非核心相关。
Charge carriers in two-dimensional transition metal dichalcogenides (TMDs), such as WSe$_2$, have their spin and valley-pseudospin locked into an optically-addressable index that is proposed as a basis for future information processing. The manipulation of this spin-valley index requires tuning its energy, typically through external magnetic field (B), which is cumbersome. Thus, other efficient routes like all-optical control of spin-valley index are desirable. Here, we show that many-body interactions amongst interlayer excitons in WSe$_2$/MoSe$_2$ heterobilayer induce a steady-state valley Zeeman splitting corresponding to B $\sim$ 6 Tesla. This anomalous splitting, present at incident powers as low as $μ$Ws, increases with power and enhances, suppresses or even flips the sign of a B-induced splitting. Moreover, the $\it{g}$-factor of valley Zeeman splitting can be tuned by $\sim$ 30 $\%$ with incident power. In addition to valleytronics, our results are relevant for achieving optical non-reciprocity using two-dimensional materials.
