Hot biexcitons driven by extreme optical confinement
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arXiv
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2026
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| _version_ | 1866914545433313280 |
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| author | Wang, Xinyi Kudtarkar, Kaushik Wu, Wenjing Jeong, Yunjo Lin, Yuxuan Cosmi Qian, Xiaofeng Kono, Junichiro Huang, Shengxi Lan, Shoufeng |
| author_facet | Wang, Xinyi Kudtarkar, Kaushik Wu, Wenjing Jeong, Yunjo Lin, Yuxuan Cosmi Qian, Xiaofeng Kono, Junichiro Huang, Shengxi Lan, Shoufeng |
| contents | A powerful means to understanding condensed matter that possesses a multi-constituent, non-isolated, and complex nature, with a preeminent example being two-dimensional (2D) materials, is studying many-body interactions. However, experimentally observing high-order many-body interactions is a daunting task due to its heavy reliance on the abundance of low-order complexes. Here, we report the observation of four-body hot biexcitons in an energetically unfavorable bilayer of tungsten disulfide (WS2) through creating extreme optical confinement. Specifically, we integrate a non-radiative bound state in the continuum (BIC) into a photonic crystal (PhC) defect cavity, forming a quasi-three-dimensional (q-3D) but open confinement for photons at the driving frequency. The extremely confined photons in both reciprocal and physical spaces then excite inherently unproductive two-body hot excitons situated slightly above the indirect bandgap so efficiently that they form overwhelmed higher-order four-body hot biexcitons. Distinctively, these hot biexcitons exhibit substantial valley polarization and coherence at room temperature, which we attribute to the topological nature of BICs and the associated q-3D confinement with an orbital angular momentum. Besides achieving room-temperature biexcitons, the q-3D confinement could be valuable for higher-order interactions, such as triexcitons, and many other many-body phenomena, including Bose-Einstein condensation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_08041 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Hot biexcitons driven by extreme optical confinement Wang, Xinyi Kudtarkar, Kaushik Wu, Wenjing Jeong, Yunjo Lin, Yuxuan Cosmi Qian, Xiaofeng Kono, Junichiro Huang, Shengxi Lan, Shoufeng Optics Materials Science A powerful means to understanding condensed matter that possesses a multi-constituent, non-isolated, and complex nature, with a preeminent example being two-dimensional (2D) materials, is studying many-body interactions. However, experimentally observing high-order many-body interactions is a daunting task due to its heavy reliance on the abundance of low-order complexes. Here, we report the observation of four-body hot biexcitons in an energetically unfavorable bilayer of tungsten disulfide (WS2) through creating extreme optical confinement. Specifically, we integrate a non-radiative bound state in the continuum (BIC) into a photonic crystal (PhC) defect cavity, forming a quasi-three-dimensional (q-3D) but open confinement for photons at the driving frequency. The extremely confined photons in both reciprocal and physical spaces then excite inherently unproductive two-body hot excitons situated slightly above the indirect bandgap so efficiently that they form overwhelmed higher-order four-body hot biexcitons. Distinctively, these hot biexcitons exhibit substantial valley polarization and coherence at room temperature, which we attribute to the topological nature of BICs and the associated q-3D confinement with an orbital angular momentum. Besides achieving room-temperature biexcitons, the q-3D confinement could be valuable for higher-order interactions, such as triexcitons, and many other many-body phenomena, including Bose-Einstein condensation. |
| title | Hot biexcitons driven by extreme optical confinement |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2605.08041 |