Cavity quantum electrodynamics with moiré photonic crystal nanocavity

Sai Yan, Hancong Li, Jingnan Yang, Xiqing Chen, Hanqing Liu, Deyan Dai, Rui Zhu, Zhikai Ma, Shushu Shi, Longlong Yang, Yu Yuan, Wenshuo Dai, Danjie Dai, Bowen Fu, Zhanchun Zuo, Haiqiao Ni, Zhichuan Niu, Can Wang (), Kuijuan Jin, Qihuang Gong and Xiulai Xu ()
Additional contact information
Sai Yan: Institute of Physics, Chinese Academy of Sciences
Hancong Li: Peking University
Jingnan Yang: Peking University
Xiqing Chen: Peking University
Hanqing Liu: Institute of Semiconductors, Chinese Academy of Sciences
Deyan Dai: Institute of Semiconductors, Chinese Academy of Sciences
Rui Zhu: Institute of Physics, Chinese Academy of Sciences
Zhikai Ma: Peking University
Shushu Shi: Institute of Physics, Chinese Academy of Sciences
Longlong Yang: Peking University
Yu Yuan: Institute of Physics, Chinese Academy of Sciences
Wenshuo Dai: Peking University
Danjie Dai: Institute of Physics, Chinese Academy of Sciences
Bowen Fu: Peking University
Zhanchun Zuo: Institute of Physics, Chinese Academy of Sciences
Haiqiao Ni: Institute of Semiconductors, Chinese Academy of Sciences
Zhichuan Niu: Institute of Semiconductors, Chinese Academy of Sciences
Can Wang: Institute of Physics, Chinese Academy of Sciences
Kuijuan Jin: Institute of Physics, Chinese Academy of Sciences
Qihuang Gong: Peking University
Xiulai Xu: Peking University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Due to the existence of flatbands within the band structure, twisting photonics introduces a possibility to enhance the interaction between excitons in single QDs and cavity photons because of the extremely high quality factor (Q) in theory. In this work, we report a Purcell effect between single QDs and moiré photonic crystal nanocavities. The moiré photonic crystal nanocavities in a GaAs slab with QDs embedded are formed by twisting two layer photonic crystal structures with specific angles. High Q, low mode volume and large overlap between QDs and cavity mode field have been achieved by optimizing the filling ratio of the single-layer photonic crystal, with which a Q of fundamental modes about 2000 is experimentally demonstrated. A photoluminescence intensity enhancement of a factor about 8.4 is observed when a single QD is in resonance with a cavity mode, with a Purcell factor of about 3.0 confirmed through the lifetime measurement. This result shows the potential of moiré photonics to implement solid-state cavity quantum electrodynamics for future optical quantum information processing.

Date: 2025
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DOI: 10.1038/s41467-025-59942-5

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