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摘要
In two-dimensional crystals of transition-metal dichalcogenides (TMDC) having strong spin-orbit interaction such as monolayer WSe2, quantum states can be labeled by a valley index tau defined in the reciprocal space and the spin index s. We developed a first-principles theoretical formalism to both qualitatively and quantitatively predict nonequilibrium quantum transport of valley-polarized currents. We propose a WSe2 TMDC transistor to selectively deliver net valley- and spin-polarized current I-tau,I- s to the source or drain by circularly polarized light under external bias. Due to the lack of translational symmetry of the real-space device, we predict a depolarization effect that increases with the decrease of the channel length of the transistor.
- 出版日期2014-11-19
- 单位北京科技大学
