Imaging of pure spin-valley diffusion current in WS 2 -WSe 2 heterostructures | Zendy

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

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Imaging of pure spin-valley diffusion current in WS ₂ -WSe ₂ heterostructures

Author(s) -

Chenhao Jin,

Jonghwan Kim,

M. Iqbal Bakti Utama,

Emma C. Regan,

Hans Kleemann,

Hui Cai,

Yuxia Shen,

Matthew Shinner,

Arjun Sengupta,

Kenji Watanabe,

Takashi Taniguchi,

Sefaattin Tongay,

Alex Zettl,

Feng Wang

Publication year - 2018

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.aao3503

Subject(s) - heterojunction , spintronics , electric field , spin (aerodynamics) , spin diffusion , current (fluid) , tungsten disulfide , diffusion , condensed matter physics , materials science , optoelectronics , physics , ferromagnetism , quantum mechanics , metallurgy , thermodynamics

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 (WS 2 )-tungsten diselenide (WSe 2 ) 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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