Strongly nonlinear nanocavity exciton-polaritons in gate-tunable monolayer semiconductors
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| Format: | Preprint |
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2024
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| _version_ | 1866916494936375296 |
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| author | Wang, Zhi He, Li Kim, Bumho Zhen, Bo |
| author_facet | Wang, Zhi He, Li Kim, Bumho Zhen, Bo |
| contents | Strong coupling between light and matter in an optical cavity provides a pathway to giant polariton nonlinearity, where effective polariton-polariton interactions are mediated by materials' nonlinear responses. The pursuit of such enhanced nonlinearity at low optical excitations, potentially down to the single-particle level, has been a central focus in the field, inspiring the exploration of novel solid-state light-matter systems. Here, we experimentally realize extremely nonlinear and robust cavity exciton-polaritons by coupling a charge-tunable MoSe2 monolayer to a photonic crystal nanocavity. We show that the observed polariton nonlinearity arises from increased exciton dephasing at high populations, leading to diminished exciton-photon coupling and ultimately the breakdown of the strong coupling condition. Remarkably, the strong mode confinement of the nanocavity enables all-optical switching of the cavity spectrum at ultralow optical excitation energies, down to ~4 fJ, on picosecond timescales. Our work paves the way for further exploration of 2D nonlinear exciton-polaritons, with promising applications in both classical and quantum all-optical information processing. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_16635 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Strongly nonlinear nanocavity exciton-polaritons in gate-tunable monolayer semiconductors Wang, Zhi He, Li Kim, Bumho Zhen, Bo Optics Mesoscale and Nanoscale Physics Strong coupling between light and matter in an optical cavity provides a pathway to giant polariton nonlinearity, where effective polariton-polariton interactions are mediated by materials' nonlinear responses. The pursuit of such enhanced nonlinearity at low optical excitations, potentially down to the single-particle level, has been a central focus in the field, inspiring the exploration of novel solid-state light-matter systems. Here, we experimentally realize extremely nonlinear and robust cavity exciton-polaritons by coupling a charge-tunable MoSe2 monolayer to a photonic crystal nanocavity. We show that the observed polariton nonlinearity arises from increased exciton dephasing at high populations, leading to diminished exciton-photon coupling and ultimately the breakdown of the strong coupling condition. Remarkably, the strong mode confinement of the nanocavity enables all-optical switching of the cavity spectrum at ultralow optical excitation energies, down to ~4 fJ, on picosecond timescales. Our work paves the way for further exploration of 2D nonlinear exciton-polaritons, with promising applications in both classical and quantum all-optical information processing. |
| title | Strongly nonlinear nanocavity exciton-polaritons in gate-tunable monolayer semiconductors |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2411.16635 |