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

Research output: Contribution to journalArticle

21 Citations (Scopus)

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

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valleys
tungsten
transition metals
disulfides
diffusion length
micrometers
degrees of freedom
electrostatics
pumps
orbitals
life (durability)
propagation
electric fields
probes
photons
spectroscopy
excitation
interactions

ASJC Scopus subject areas

  • General

Cite this

Jin, C., Kim, J., Iqbal Bakti Utama, M., Regan, E. C., Kleemann, H., Cai, H., ... 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

Imaging of pure spin-valley diffusion current in WS2-WSe2 heterostructures. / Jin, Chenhao; Kim, Jonghwan; Iqbal Bakti Utama, M.; Regan, Emma C.; Kleemann, Hans; Cai, Hui; Shen, Yuxia; Shinner, Matthew James; Sengupta, Arjun; Watanabe, Kenji; Taniguchi, Takashi; Tongay, Sefaattin; Zettl, Alex; Wang, Feng.

In: Science, Vol. 360, No. 6391, 25.05.2018, p. 893-896.

Research output: Contribution to journalArticle

Jin, C, Kim, J, Iqbal Bakti Utama, M, Regan, EC, Kleemann, H, Cai, H, Shen, Y, Shinner, MJ, 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, vol. 360, no. 6391, pp. 893-896. https://doi.org/10.1126/science.aao3503
Jin C, Kim J, Iqbal Bakti Utama M, Regan EC, Kleemann H, Cai H et al. Imaging of pure spin-valley diffusion current in WS2-WSe2 heterostructures. Science. 2018 May 25;360(6391):893-896. https://doi.org/10.1126/science.aao3503
Jin, Chenhao ; Kim, Jonghwan ; Iqbal Bakti Utama, M. ; Regan, Emma C. ; Kleemann, Hans ; Cai, Hui ; Shen, Yuxia ; Shinner, Matthew James ; Sengupta, Arjun ; Watanabe, Kenji ; Taniguchi, Takashi ; Tongay, Sefaattin ; Zettl, Alex ; Wang, Feng. / Imaging of pure spin-valley diffusion current in WS2-WSe2 heterostructures. In: Science. 2018 ; Vol. 360, No. 6391. pp. 893-896.
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