Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/66025
Título: | Near-unity light absorption in a monolayer WS2 van der Waals heterostructure cavity |
Autor(es): | Epstein, Itai 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 |
Palavras-chave: | TMD Excitons Unity absorption 2D materials Light-matter interaction Exciton complexes |
Data: | 2020 |
Editora: | American Chemical Society |
Revista: | Nano Letters |
Resumo(s): | 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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/66025 |
DOI: | 10.1021/acs.nanolett.0c00492 |
ISSN: | 1530-6984 |
e-ISSN: | 1530-6992 |
Versão da editora: | https://pubs.acs.org/doi/10.1021/acs.nanolett.0c00492 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | PHYSICS OF QUANTUM MATERIALS AND BIONANOSTRUCTURES (2018 - ...) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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1908.07598.pdf | 2,39 MB | Adobe PDF | Ver/Abrir |