论文标题
正常电场增强了硅硅的光诱导极化
Normal electric field enhanced light-induced polarizations in silicene
论文作者
论文摘要
在硅烯中研究了交错势对光诱导的自旋和伪自旋极化的作用。已经表明，在存在圆形极化的光发射的情况下，通过在存在的外部垂直电场中施加外部垂直电场，在硅薄片中出现了非平衡自旋和伪自旋极化。因此，该电场导致非常接近狄拉克点的伪旋转状态可以被视为伪磁场。已经表明，交错的潜在诱导的自旋valley锁定和伪旋转解析带负责增强自旋和伪旋转极化。同时，自旋谷锁定表明，自旋和山谷极化同时存在，在低费米能量下，人口不平衡几乎相同，可用于磁性检测山谷极化。已经表明，自旋谷锁定会导致保护自旋极化，以防止弹性散射状态中的松弛。此外，结果表明，伪旋转电流可以通过圆极化的光产生，这可以通过k空间中状态的不对称光吸收来解释。
The role of staggered potential on light-induced spin and pseudo-spin polarization has been investigated in silicene. It has been shown that non-equilibrium spin and pseudo-spin polarizations are emerged in silicene sheet by applying an external perpendicular electric field in the presence of circularly polarized light emission. This electric field results in pseudo-spin resolved states very close to the Dirac points therefore could be considered as a pseudomagnetic field. It has been shown that staggered potential induced spin-valley locking and pseudo-spin resolved bands are responsible for enhancement of the spin and pseudo-spin polarizations. Meanwhile, spin-valley locking suggests a coexistence of both spin and valley polarizations with nearly identical population imbalance at low Fermi energies which could be employed for magnetic detection of the valley polarization. It has been shown that spin-valley locking results in protection of the spin polarizations against the relaxations in elastic scattering regime. In addition results indicate that the pseudo-spin current can be generated by the circularly polarized light which could be explained by asymmetric light absorption of the states in k-space.
