Tunable geometric photocurrent in van der Waals heterostructure

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 p...

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Main Authors: Abdullah Rasmita, Jiang, Chongyun, Ma, Hui, Ji, Zhurun, Agarwal, Ritesh, Gao, Weibo
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/156021
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1560212023-02-28T20:02:13Z Tunable geometric photocurrent in van der Waals heterostructure Abdullah Rasmita Jiang, Chongyun Ma, Hui Ji, Zhurun Agarwal, Ritesh Gao, Weibo School of Physical and Mathematical Sciences The Photonics Institute Centre for Disruptive Photonic Technologies (CDPT) Science::Physics::Optics and light Van der Waals Forces Photocurrents Quantum Hall Effect Mesoscopic Systems 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. Ministry of Education (MOE) National Research Foundation (NRF) Published version China Scholarship Council (No. 201709345003); National Natural Science Foundation of China (No. 61974075, No. 61704121); Agency for Science, Technology and Research (QTE); National Research Foundation Singapore (QEP, NRF-CRP21-2018-0007); Ministry of Education - Singapore (MOE2016-T2-1-163, MOE2016-T2-2-077, MOE2016-T3-1-006 (S)) 2022-03-31T02:54:43Z 2022-03-31T02:54:43Z 2020 Journal Article 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. https://dx.doi.org/10.1364/OPTICA.393381 2334-2536 https://hdl.handle.net/10356/156021 10.1364/OPTICA.393381 2-s2.0-85091393946 9 7 1204 1208 en QEP-NRF-CRP21-2018-000 MOE2016-T2-1-163 MOE2016-T2-2-077 MOE2016-T3-1-006 (S) Optica © 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. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics::Optics and light
Van der Waals Forces
Photocurrents
Quantum Hall Effect
Mesoscopic Systems
spellingShingle Science::Physics::Optics and light
Van der Waals Forces
Photocurrents
Quantum Hall Effect
Mesoscopic Systems
Abdullah Rasmita
Jiang, Chongyun
Ma, Hui
Ji, Zhurun
Agarwal, Ritesh
Gao, Weibo
Tunable geometric photocurrent in van der Waals heterostructure
description 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.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Abdullah Rasmita
Jiang, Chongyun
Ma, Hui
Ji, Zhurun
Agarwal, Ritesh
Gao, Weibo
format Article
author Abdullah Rasmita
Jiang, Chongyun
Ma, Hui
Ji, Zhurun
Agarwal, Ritesh
Gao, Weibo
author_sort Abdullah Rasmita
title Tunable geometric photocurrent in van der Waals heterostructure
title_short Tunable geometric photocurrent in van der Waals heterostructure
title_full Tunable geometric photocurrent in van der Waals heterostructure
title_fullStr Tunable geometric photocurrent in van der Waals heterostructure
title_full_unstemmed Tunable geometric photocurrent in van der Waals heterostructure
title_sort tunable geometric photocurrent in van der waals heterostructure
publishDate 2022
url https://hdl.handle.net/10356/156021
_version_ 1759857110378610688