Imaging of pure spin-valley diffusion current in WS2-WSe2 heterostructures
SCIE
SCOPUS
- Title
- Imaging of pure spin-valley diffusion current in WS2-WSe2 heterostructures
- Authors
- Jin, Chenhao; Kim, Jonghwan; Utama, M. Iqbal Bakti; Regan, Emma C.; Kleemann, Hans; Cai, Hui; Shen, Yuxia; Shinner, Matthew James; Sengupta, Arjun; Watanabe, Kenji; Taniguchi, Takashi; Tongay, Sefaattin; Zettl, Alex; Wang, Feng
- Date Issued
- 2018-05
- Publisher
- AMER ASSOC ADVANCEMENT SCIENCE
- Abstract
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/95890
- DOI
- 10.1126/science.aao3503
- ISSN
- 0036-8075
- Article Type
- Article
- Citation
- SCIENCE, vol. 360, no. 6391, page. 893 - 896, 2018-05
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- There are no files associated with this item.
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