Abstract The nontrivial magnetoopitcal effects are predicted to arise at the visible frequency range for monolayer transition metal dichalcogenides upon the application of magnetic exchange interactions. However, their magnetoopitcal rotation angles at the terahertz frequency range are always low, which hinders their practical applications in the terahertz magnetoopitcal devices. In this letter, we theoretically demonstrate that the magnetoopitcal effects of monolayer transition metal dichalcogenides at the terahertz frequency range can be enhanced and controlled via introducing the Rashba spin orbit coupling, whose rotation angles are comparable with those of conventional bulky magnetic materials. Such an effect originates from the change of spin-up and spin-down bands in the band structures of monolayer transition metal dichalcogenides when the Rashba spin orbit coupling and magnetic exchange interaction coexist, which enables the spin-flip intraband optical transitions and thus generates the terahertz magnetoopitcal responses. Our results open up possibilities for the use of Rashba spin orbit coupling to generate as well as control the magnetoopitcal effects in two-dimensional layered materials.

中文翻译：

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Rashba自旋轨道耦合诱导单层过渡金属二硫属化物的磁光效应

摘要 在应用磁交换相互作用后，单层过渡金属二硫属化物预计会在可见频率范围内产生非平凡的磁光效应。然而，它们在太赫兹频率范围内的磁光旋转角总是很低，这阻碍了它们在太赫兹磁光器件中的实际应用。在这封信中，我们从理论上证明了单层过渡金属二硫属化物在太赫兹频率范围内的磁光效应可以通过引入 Rashba 自旋轨道耦合来增强和控制，其旋转角与传统大块磁性材料的旋转角相当。这种效应源于当 Rashba 自旋轨道耦合和磁交换相互作用共存时，单层过渡金属二硫属化物的能带结构中自旋向上和自旋向下能带的变化，从而使自旋翻转带内光学跃迁产生太赫兹磁光响应。我们的结果为使用 Rashba 自旋轨道耦合在二维层状材料中产生和控制磁光效应开辟了可能性。