Charged biexciton polaritons sustaining strong nonlinearity in 2D semiconductor-based nanocavities

Ke Wei (), Qirui Liu, Yuxiang Tang, Yingqian Ye, Zhongjie Xu and Tian Jiang ()
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Ke Wei: National University of Defense Technology
Qirui Liu: National University of Defense Technology
Yuxiang Tang: National University of Defense Technology
Yingqian Ye: National University of Defense Technology
Zhongjie Xu: National University of Defense Technology
Tian Jiang: National University of Defense Technology

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Controlling the interaction between light and matter at micro- and nano-scale can provide new opportunities for modern optics and optoelectronics. An archetypical example is polariton, a half-light-half-matter quasi particle inheriting simultaneously the robust coherence of light and the strong interaction of matter, which plays an important role in many exotic phenomena. Here, we open up a new kind of cooperative coupling between plasmon and different excitonic complexes in WS2-silver nanocavities, namely plasmon-exciton-trion-charged biexciton four coupling states. Thanks to the large Bohr radius of up to 5 nm, the charged biexciton polariton exhibits strong saturation nonlinearity, ~30 times higher than the neutral exciton polariton. Transient absorption dynamics further reveal the ultrafast many-body interaction nature, with a timescale of

Date: 2023
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DOI: 10.1038/s41467-023-41079-y

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