High luminescence efficiency of multi-valley excitonic complexes in heavily doped WSe2 monolayer
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arXiv
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| Format: | Preprint |
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2025
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| author | Roux, Sébastien Guyot, Tilly Torres-Dias, Abraao Cefas Lagarde, Delphine Lombez, Laurent Van Tuan, Dinh Kim, Junghwan Watanabe, Kenji Marie, Xavier Taniguchi, Takashi Dery, Hanan Robert, Cedric |
| author_facet | Roux, Sébastien Guyot, Tilly Torres-Dias, Abraao Cefas Lagarde, Delphine Lombez, Laurent Van Tuan, Dinh Kim, Junghwan Watanabe, Kenji Marie, Xavier Taniguchi, Takashi Dery, Hanan Robert, Cedric |
| contents | Monolayers of group-VI transition-metal dichalcogenides (TMDs) are two-dimensional semiconductors that exhibit exceptionally strong light-matter coupling yet typically suffer from low emission quantum yields. In this letter, we investigate the heavily n-doped regime of a WSe$_2$ monolayer and show that multi-particle excitonic complexes produce photoluminescence signals up to two orders of magnitude stronger than in the neutral state. Time-resolved photoluminescence and differential reflectivity measurements reveal that the quantum yield rises with carrier density and exceeds 50% for electron concentrations above 10$^{13}$ cm$^{-2}$. These findings establish TMD monolayers as a platform for exploring excitonic complexes in high-density electron gases and point toward new opportunities for efficient, atomically thin light emitters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_04306 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High luminescence efficiency of multi-valley excitonic complexes in heavily doped WSe2 monolayer Roux, Sébastien Guyot, Tilly Torres-Dias, Abraao Cefas Lagarde, Delphine Lombez, Laurent Van Tuan, Dinh Kim, Junghwan Watanabe, Kenji Marie, Xavier Taniguchi, Takashi Dery, Hanan Robert, Cedric Mesoscale and Nanoscale Physics Materials Science Monolayers of group-VI transition-metal dichalcogenides (TMDs) are two-dimensional semiconductors that exhibit exceptionally strong light-matter coupling yet typically suffer from low emission quantum yields. In this letter, we investigate the heavily n-doped regime of a WSe$_2$ monolayer and show that multi-particle excitonic complexes produce photoluminescence signals up to two orders of magnitude stronger than in the neutral state. Time-resolved photoluminescence and differential reflectivity measurements reveal that the quantum yield rises with carrier density and exceeds 50% for electron concentrations above 10$^{13}$ cm$^{-2}$. These findings establish TMD monolayers as a platform for exploring excitonic complexes in high-density electron gases and point toward new opportunities for efficient, atomically thin light emitters. |
| title | High luminescence efficiency of multi-valley excitonic complexes in heavily doped WSe2 monolayer |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2511.04306 |