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Title: Observation of Bragg polaritons in monolayer tungsten disulphide
Authors: Wang, Xu
Wu, Lishu
Zhang, Xuewen
Yang, Weihuang
Sun, Zheng
Shang, Jingzhi
Huang, Wei
Yu, Ting
Keywords: Science::Physics::Optics and light
Issue Date: 2022
Source: 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.
Project: MOE 2019-T2-1-044
NRF-CRP-21- 2018-0007
Journal: Nano Research
Abstract: 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.]
ISSN: 1998-0124
DOI: 10.1007/s12274-021-3691-6
Rights: © 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.
Fulltext Permission: embargo_20230307
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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