Detalhes bibliográficos
| Resumo: | Excitons in monolayer transition-metal-dichalcogenides (TMDs) dominate their optical response and exhibit strong light-matter interactions with lifetime-limited emission. While various approaches have been applied to enhance light-exciton interactions in TMDs, the achieved strength have been far below unity, and a complete picture of its underlying physical mechanisms and fundamental limits has not been provided. Here, we introduce a TMD-based van der Waals heterostructure cavity that provides near-unity excitonic absorption, and emission of excitonic complexes that are observed at ultralow excitation powers. Our results are in full agreement with a quantum theoretical framework introduced to describe the light-exciton-cavity interaction. We find that the subtle interplay between the radiative, nonradiative and dephasing decay rates plays a crucial role, and unveil a universal absorption law for excitons in 2D systems. This enhanced light-exciton interaction provides a platform for studying excitonic phase-transitions and quantum nonlinearities and enables new possibilities for 2D semiconductor-based optoelectronic devices. |
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| Autores principais: | Epstein, Itai |
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| Outros Autores: | Terrés, Bernat; Chaves, André J.; Pusapati, Varun-Varma; Rhodes, Daniel A.; Frank, Bettina; Zimmermann, Valentin; Qin, Ying; Watanabe, Kenji; Taniguchi, Takashi; Giessen, Harald; Tongay, Sefaattin; Hone, James C.; Peres, N. M. R.; Koppens, Frank |
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| Assunto: | TMD Excitons Unity absorption 2D materials Light-matter interaction Exciton complexes |
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| Ano: | 2020 |
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| País: | Portugal |
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| Tipo de documento: | artigo |
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| Tipo de acesso: | acesso aberto |
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| Instituição associada: | Universidade do Minho |
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| Idioma: | inglês |
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| Origem: | RepositóriUM - Universidade do Minho |
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