Abstract
In two-dimensional crystals of transition-metal dichalcogenides (TMDC) having strong spin-orbit interaction such as monolayer , quantum states can be labeled by a valley index defined in the reciprocal space and the spin index . We developed a first-principles theoretical formalism to both qualitatively and quantitatively predict nonequilibrium quantum transport of valley-polarized currents. We propose a TMDC transistor to selectively deliver net valley- and spin-polarized current 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.
- Received 21 July 2014
- Revised 3 November 2014
DOI:https://doi.org/10.1103/PhysRevB.90.195428
©2014 American Physical Society