This study demonstrates room-temperature bound states in the continuum (BIC) polariton condensation in perovskite photonic crystal lattices. Using cesium lead bromide (CsPbBr3) perovskite, strong coupling between BIC modes and excitons was achieved, resulting in directional vortex beam emission with long-range coherence. A switching effect among miniaturized BIC polariton modes was also observed through polariton-polariton scattering. This work advances the potential of BIC polariton condensates for integrated photonic and topological circuits.

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, Xinfeng Liu