Manipulating spin-polarized photocurrents in 2D transition metal dichalcogenides.
basic_science · Level V
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- Record sourced from PubMed, PMID 27001834.
- Also identified by DOI 10.1073/pnas.1523012113 and PMC identifier 4833241.
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Abstract
Manipulating spin polarization of electrons in nonmagnetic semiconductors by means of electric fields or optical fields is an essential theme of the conceptual nonmagnetic semiconductor-based spintronics. Here we experimentally demonstrate an electric method of detecting spin polarization in monolayer transition metal dichalcogenides (TMDs) generated by circularly polarized optical pumping. The spin-polarized photocurrent is achieved through the valley-dependent optical selection rules and the spin-valley locking in monolayer WS2, and electrically detected by a lateral spin-valve structure with ferromagnetic contacts. The demonstrated long spin-valley lifetime, the unique valley-contrasted physics, and the spin-valley locking make monolayer WS2 an unprecedented candidate for semiconductor-based spintronics.