Revealing broken valley symmetry of quantum emitters in WSe2 with chiral nanocavities

Longlong Yang, Yu Yuan, Bowen Fu, Jingnan Yang, Danjie Dai, Shushu Shi, Sai Yan, Rui Zhu, Xu Han, Hancong Li, Zhanchun Zuo, Can Wang (), Yuan Huang (), Kuijuan Jin, Qihuang Gong and Xiulai Xu ()
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Longlong Yang: Chinese Academy of Sciences
Yu Yuan: Chinese Academy of Sciences
Bowen Fu: Peking University
Jingnan Yang: Peking University
Danjie Dai: Chinese Academy of Sciences
Shushu Shi: Chinese Academy of Sciences
Sai Yan: Chinese Academy of Sciences
Rui Zhu: Chinese Academy of Sciences
Xu Han: Beijing Institute of Technology
Hancong Li: Peking University
Zhanchun Zuo: Chinese Academy of Sciences
Can Wang: Chinese Academy of Sciences
Yuan Huang: Beijing Institute of Technology
Kuijuan Jin: Chinese Academy of Sciences
Qihuang Gong: Peking University
Xiulai Xu: Peking University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Single photon emission of quantum emitters (QEs) carrying internal degrees of freedom such as spin and angular momentum plays an important role in quantum optics. Recently, QEs in two-dimensional semiconductors have attracted great interest as promising quantum light sources. However, whether those QEs are characterized by the same valley physics as delocalized valley excitons is still under debate. Moreover, the potential applications of such QEs still need to be explored. Here we show experimental evidence of valley symmetry breaking for neutral QEs in WSe2 monolayer by interacting with chiral plasmonic nanocavities. The anomalous magneto-optical behaviour of the coupled QEs suggests that the polarization state of emitted photon is modulated by the chiral nanocavity instead of the valley-dependent optical selection rules. Calculations of cavity quantum electrodynamics further show the absence of intrinsic valley polarization. The cavity-dependent circularly polarized single-photon output also offers a strategy for future applications in chiral quantum optics.

Date: 2023
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DOI: 10.1038/s41467-023-39972-7

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