Observation of Bragg polaritons in monolayer tungsten disulphide

Strong light-matter interactions involved with photons and quasiparticles are fundamentally interesting to access the wealthy many-body physics in quantum mechanics. The emerging two-dimensional (2D) semiconductors with large exciton binding energies and strong quantum confinement allow to investiga...

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Main Authors: Wang, Xu, Wu, Lishu, Zhang, Xuewen, Yang, Weihuang, Sun, Zheng, Shang, Jingzhi, Huang, Wei, Yu, Ting
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/156060
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spelling sg-ntu-dr.10356-1560602023-02-28T20:03:27Z Observation of Bragg polaritons in monolayer tungsten disulphide Wang, Xu Wu, Lishu Zhang, Xuewen Yang, Weihuang Sun, Zheng Shang, Jingzhi Huang, Wei Yu, Ting School of Physical and Mathematical Sciences Science::Physics::Optics and light Bragg Polariton Exciton-Photon Coupling Strong light-matter interactions involved with photons and quasiparticles are fundamentally interesting to access the wealthy many-body physics in quantum mechanics. The emerging two-dimensional (2D) semiconductors with large exciton binding energies and strong quantum confinement allow to investigate exciton-photon coupling at elevated temperatures. Here we report room-temperature formation of Bragg polaritons in monolayer semiconductor on a dielectric mirror through the exciton-Bragg photon coupling. With the negative detuning energy of ∼ 30 meV, angle-resolved reflection signals reveal anti-crossing behaviors of lower and upper polariton branches at ±18° together with the Rabi splitting of 10 meV. Meanwhile, the strengthened photoluminescence appears in the lower polariton branch right below the anti-crossing angles, indicating the presence of the characteristic bottleneck effect caused by the slowing exciton-polariton energy relaxation towards the band minimum. The extracted coupling strength is between the ones of weak and distinct strong coupling regimes, where the eigenenergy splitting induced by the moderate coupling is resolvable but not large enough to fully separate two polaritonic components. Our work develops a simplified strategy to generate exciton-polaritons in 2D semiconductors and can be further extended to probe the intriguing bosonic characteristics of these quasiparticles, such as Bose-Einstein condensation, polariton lasing and superfluidity, directly at the material surfaces.[Figure not available: see fulltext.] Ministry of Education (MOE) National Research Foundation (NRF) Submitted/Accepted version We thank the support of the Ministry of Education of Singapore (MOE 2019-T2-1-044), Singapore National Research Foundation under the Competitive Research Programs (No. NRF-CRP-21- 2018-0007), the Fundamental Research Funds for the Central Universities of China, National Natural Science Foundation of China (Nos. 61904151 and 51173081), Natural Science Foundation of Shaanxi (No. 2020JM-108), Joint Research Funds of Department of Science & Technology of Shaanxi Province and Northwestern Polytechnical University (No. 2020GXLHZ-020), Ministry of Education of China (IRT1148), and Zhejiang Provincial Natural Science Foundation of China (No. LGG19F040003). 2022-04-01T08:27:03Z 2022-04-01T08:27:03Z 2022 Journal Article Wang, X., Wu, L., Zhang, X., Yang, W., Sun, Z., Shang, J., Huang, W. & Yu, T. (2022). Observation of Bragg polaritons in monolayer tungsten disulphide. Nano Research, 15(2), 1479-1485. https://dx.doi.org/10.1007/s12274-021-3691-6 1998-0124 https://hdl.handle.net/10356/156060 10.1007/s12274-021-3691-6 2-s2.0-85113135845 2 15 1479 1485 en MOE 2019-T2-1-044 NRF-CRP-21- 2018-0007 Nano Research © 2021 Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. All rights reserved. This paper was published in Nano Research and is made available with permission of Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. 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
Bragg Polariton
Exciton-Photon Coupling
spellingShingle Science::Physics::Optics and light
Bragg Polariton
Exciton-Photon Coupling
Wang, Xu
Wu, Lishu
Zhang, Xuewen
Yang, Weihuang
Sun, Zheng
Shang, Jingzhi
Huang, Wei
Yu, Ting
Observation of Bragg polaritons in monolayer tungsten disulphide
description Strong light-matter interactions involved with photons and quasiparticles are fundamentally interesting to access the wealthy many-body physics in quantum mechanics. The emerging two-dimensional (2D) semiconductors with large exciton binding energies and strong quantum confinement allow to investigate exciton-photon coupling at elevated temperatures. Here we report room-temperature formation of Bragg polaritons in monolayer semiconductor on a dielectric mirror through the exciton-Bragg photon coupling. With the negative detuning energy of ∼ 30 meV, angle-resolved reflection signals reveal anti-crossing behaviors of lower and upper polariton branches at ±18° together with the Rabi splitting of 10 meV. Meanwhile, the strengthened photoluminescence appears in the lower polariton branch right below the anti-crossing angles, indicating the presence of the characteristic bottleneck effect caused by the slowing exciton-polariton energy relaxation towards the band minimum. The extracted coupling strength is between the ones of weak and distinct strong coupling regimes, where the eigenenergy splitting induced by the moderate coupling is resolvable but not large enough to fully separate two polaritonic components. Our work develops a simplified strategy to generate exciton-polaritons in 2D semiconductors and can be further extended to probe the intriguing bosonic characteristics of these quasiparticles, such as Bose-Einstein condensation, polariton lasing and superfluidity, directly at the material surfaces.[Figure not available: see fulltext.]
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Wang, Xu
Wu, Lishu
Zhang, Xuewen
Yang, Weihuang
Sun, Zheng
Shang, Jingzhi
Huang, Wei
Yu, Ting
format Article
author Wang, Xu
Wu, Lishu
Zhang, Xuewen
Yang, Weihuang
Sun, Zheng
Shang, Jingzhi
Huang, Wei
Yu, Ting
author_sort Wang, Xu
title Observation of Bragg polaritons in monolayer tungsten disulphide
title_short Observation of Bragg polaritons in monolayer tungsten disulphide
title_full Observation of Bragg polaritons in monolayer tungsten disulphide
title_fullStr Observation of Bragg polaritons in monolayer tungsten disulphide
title_full_unstemmed Observation of Bragg polaritons in monolayer tungsten disulphide
title_sort observation of bragg polaritons in monolayer tungsten disulphide
publishDate 2022
url https://hdl.handle.net/10356/156060
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