Anisotropic exciton–polaritons in 2D single-crystalline PEA 2 PbBr 4 perovskites at room temperature

Abstract Two-dimensional (2D) single-crystalline perovskites are a suitable material for investigating the strong exciton–photon interaction due to the large exciton binding energy. Here, we grow high-quality 2D single-crystalline PEA 2 PbBr 4 thin film in situ in between a pair of distributed Bragg...

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Published in:Journal of physics. D, Applied physics Applied physics, 2023-02, Vol.56 (10), p.105301
Main Authors: Chu, Zihao, Chen, Huanqing, Mao, Xinrui, Li, Yanping, Xu, Wanjin, Ran, Guangzhao
Format: Article
Language:English
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Summary:Abstract Two-dimensional (2D) single-crystalline perovskites are a suitable material for investigating the strong exciton–photon interaction due to the large exciton binding energy. Here, we grow high-quality 2D single-crystalline PEA 2 PbBr 4 thin film in situ in between a pair of distributed Bragg reflectors and construct an anisotropic exciton–polariton microcavity. Clear evidence for strong exciton–photon coupling is observed and represented by a large coupling strength of 211.8 meV. The observed transverse electric–transverse magnetic splitting at the point where the in-plane wave vector is zero indicates crystal birefringence. The effective refractive indices for these two orthogonal polarization directions are derived to have a large difference, corresponding to a material index difference of 0.28, and then an in-plane refractive index ellipse is built for the material. This work shows that the 2D anisotropic perovskite microcavity can not only behave as a platform for characterizing the anisotropic properties of a material but also as a promising room-temperature polaritonic device.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/acb783