Journal
SCIENCE
Volume 360, Issue 6391, Pages 893-896Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aao3503
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Funding
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy [DE-AC02-05-CH11231]
- NSF EFRI program [EFMA-1542741]
- JSPS KAKENHI [JP15K21722]
- NSF DMR CAREER [1552220]
- Deutsche Forschungsgemeinschaft [KL 2961/1-1]
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Transition metal dichalcogenide (TMDC) materials are promising for spintronic and valleytronic applications because valley-polarized excitations can be generated and manipulated with circularly polarized photons and the valley and spin degrees of freedom are locked by strong spin-orbital interactions. In this study we demonstrate efficient generation of a pure and locked spin-valley diffusion current in tungsten disulfide (WS2)-tungsten diselenide (WSe2) heterostructures without any driving electric field. We imaged the propagation of valley current in real time and space by pump-probe spectroscopy. The valley current in the heterostructures can live for more than 20 microseconds and propagate over 20 micrometers; both the lifetime and the diffusion length can be controlled through electrostatic gating. The high-efficiency and electric-field-free generation of a locked spin-valley current in TMDC heterostructures holds promise for applications in spin and valley devices.
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