Exciton polariton condensation from bound states in the continuum at room temperature

Xianxin Wu, Shuai Zhang, Jiepeng Song, Xinyi Deng, Wenna Du, Xin Zeng, Yuyang Zhang, Zhiyong Zhang, Yuzhong Chen, Yubin Wang, Chuanxiu Jiang, Yangguang Zhong, Bo Wu, Zhuoya Zhu, Yin Liang, Qing Zhang (), Qihua Xiong () and Xinfeng Liu ()
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Xianxin Wu: National Center for Nanoscience and Technology
Shuai Zhang: National Center for Nanoscience and Technology
Jiepeng Song: Peking University
Xinyi Deng: Peking University
Wenna Du: National Center for Nanoscience and Technology
Xin Zeng: National Center for Nanoscience and Technology
Yuyang Zhang: National Center for Nanoscience and Technology
Zhiyong Zhang: National Center for Nanoscience and Technology
Yuzhong Chen: Beijing Academy of Quantum Information Sciences
Yubin Wang: Tsinghua University
Chuanxiu Jiang: National Center for Nanoscience and Technology
Yangguang Zhong: National Center for Nanoscience and Technology
Bo Wu: South China Normal University
Zhuoya Zhu: National Center for Nanoscience and Technology
Yin Liang: Peking University
Qing Zhang: Peking University
Qihua Xiong: Beijing Academy of Quantum Information Sciences
Xinfeng Liu: National Center for Nanoscience and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Exciton–polaritons (polaritons) resulting from the strong exciton–photon interaction stimulates the development of novel low-threshold coherent light sources to circumvent the ever-increasing energy demands of optical communications1–3. Polaritons from bound states in the continuum (BICs) are promising for Bose–Einstein condensation owing to their theoretically infinite quality factors, which provide prolonged lifetimes and benefit the polariton accumulations4–7. However, BIC polariton condensation remains limited to cryogenic temperatures ascribed to the small exciton binding energies of conventional material platforms. Herein, we demonstrated room-temperature BIC polariton condensation in perovskite photonic crystal lattices. BIC polariton condensation was demonstrated at the vicinity of the saddle point of polariton dispersion that generates directional vortex beam emission with long-range coherence. We also explore the peculiar switching effect among the miniaturized BIC polariton modes through effective polariton−polariton scattering. Our work paves the way for the practical implementation of BIC polariton condensates for integrated photonic and topological circuits.

Date: 2024
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DOI: 10.1038/s41467-024-47669-8

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