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Title: Tunable geometric photocurrent in van der Waals heterostructure
Authors: Abdullah Rasmita
Jiang, Chongyun
Ma, Hui
Ji, Zhurun
Agarwal, Ritesh
Gao, Weibo
Keywords: Science::Physics::Optics and light
Issue Date: 2020
Source: Abdullah Rasmita, Jiang, C., Ma, H., Ji, Z., Agarwal, R. & Gao, W. (2020). Tunable geometric photocurrent in van der Waals heterostructure. Optica, 7(9), 1204-1208.
Project: QEP-NRF-CRP21-2018-000
MOE2016-T3-1-006 (S)
Journal: Optica
Abstract: Utilizing the spin or valley degree of freedom is a promising approach for realizing more energy-efficient information processing devices. Circularly polarized light can be used to generate spin/valley current in monolayer 2D transition metal dichalcogenides. We observe a geometrically dependent photocurrent in heterostructure MoS2/WSe2, where light with a different circular polarization generates photocurrents in opposite directions. Furthermore, we show that this photocurrent persists even at room temperature, and it can be controlled using an in-plane electric field and back gating. We explain the observed phenomena via valley-dependent valence band shift and the valley optical selection rule. This finding may facilitate the use of 2D heterostructures as a platform for opto-valleytronics and opto-spintronics devices.
ISSN: 2334-2536
DOI: 10.1364/OPTICA.393381
Schools: School of Physical and Mathematical Sciences 
Research Centres: The Photonics Institute 
Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for noncommercial purposes and appropriate attribution is maintained. All other rights are reserved.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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