论文标题
倾斜的狄拉克带的各向异性纵向光电传导率1t $^\ prime $ -mos $ _2 $
Anisotropic longitudinal optical conductivities of tilted Dirac bands in 1T$^\prime$-MoS$_2$
论文作者
论文摘要
1t $^\ Prime $ -MOS $ _2 $在存在外部垂直电场的情况下展示谷旋转式倾斜式零件，并在电场的临界值周围进行拓扑绝缘器和带绝缘子之间的拓扑相变。在线性响应理论中，我们从理论上研究了未居住和掺杂的1T $^\ prime $ -MOS $ _2 $的倾斜狄拉克带的各向异性纵向光电传导性，包括垂直电场的效果。揭示了自旋轨道耦合缝隙，带倾斜和垂直电场对倾斜狄拉克带的光电电导率的影响。提出了一种理论方案，该方案通过纵向光导率的外来行为进行1T $^\ Prime $ -MOS $ _2 $中的拓扑相变。 1T $^\ prime $ -MOS $ _2 $的结果预计在质量上有效，对于其他单层倾斜的零毛材料，例如$α$ -SNS $ _2 $，TACOTE $ _2 $，而Tairte $ _4 $，由于其乐队结构的相似之处。
1T$^\prime$-MoS$_2$ exhibits valley-spin-polarized tilted Dirac bands in the presence of external vertical electric field and undergoes a topological phase transition between the topological insulator and band insulator around the critical value of the electric field. Within the linear response theory, we theoretically investigate the anisotropic longitudinal optical conductivities of tilted Dirac bands in both undoped and doped 1T$^\prime$-MoS$_2$, including the effects of the vertical electric field. The influence of the spin-orbit coupling gap, band tilting, and vertical electric field on the optical conductivities of tilted Dirac bands is revealed. A theoretical scheme for probing the topological phase transition in 1T$^\prime$-MoS$_2$ via exotic behaviors of longitudinal optical conductivities is proposed. The results for 1T$^\prime$-MoS$_2$ are expected to be qualitatively valid for other monolayer tilted gapped Dirac materials, such as $α$-SnS$_2$, TaCoTe$_2$, and TaIrTe$_4$, due to the similarity in their band structures.
