Imaging of pure spin-valley diffusion current in WS2-WSe2 heterostructures

Chenhao Jin, Jonghwan Kim, M. Iqbal Bakti Utama, Emma C. Regan, Hans Kleemann, Hui Cai, Yuxia Shen, Matthew James Shinner, Arjun Sengupta, Kenji Watanabe, Takashi Taniguchi, Sefaattin Tongay, Alex Zettl, Feng Wang

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42 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)893-896
Number of pages4
JournalScience
Volume360
Issue number6391
DOIs
StatePublished - May 25 2018

ASJC Scopus subject areas

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    Jin, C., Kim, J., Iqbal Bakti Utama, M., Regan, E. C., Kleemann, H., Cai, H., Shen, Y., Shinner, M. J., Sengupta, A., Watanabe, K., Taniguchi, T., Tongay, S., Zettl, A., & Wang, F. (2018). Imaging of pure spin-valley diffusion current in WS2-WSe2 heterostructures. Science, 360(6391), 893-896. https://doi.org/10.1126/science.aao3503