Doping-Induced Brightening of Dark Excitons and Trions in a WSe$_2$ Monolayer
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915964063318016 |
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| author | Krasucki, Grzegorz Slobodeniuk, Artur O. Walczyk, Kacper Olkowska-Pucko, Katarzyna Watanabe, Kenji Taniguchi, Takashi Babiński, Adam Molas, Maciej R. |
| author_facet | Krasucki, Grzegorz Slobodeniuk, Artur O. Walczyk, Kacper Olkowska-Pucko, Katarzyna Watanabe, Kenji Taniguchi, Takashi Babiński, Adam Molas, Maciej R. |
| contents | Optically dark excitonic states play a critical role in the valleytronic, electronic, and optical properties of monolayer semiconducting transition metal dichalcogenides. Here, we investigate how electrostatic doping affects the in-plane magnetic-field-induced activation of dark excitonic complexes in a gated WSe$_2$ monolayer. By continuously tuning the carrier density via gate voltage, we access $n$-type, charge-neutral, and $p$-type regimes and track the corresponding brightening dynamics. We find that the brightening rates of the dark negative trion ($T^{D-}$), dark neutral exciton ($X^{D}$), and dark positive trion ($T^{D+}$) exhibit a strong and nontrivial dependence on doping. In particular, the pronounced asymmetry in the brightening behaviour of the neutral $X^{D}$ complex and the charged $T^{D-}$ and $T^{D+}$ trions reveals distinct underlying carrier interactions, which we describe using a rate-equation model for their steady-state populations. These findings highlight the key role of dark excitonic complexes in governing the optical response and carrier dynamics of doped S-TMD monolayers. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_25553 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Doping-Induced Brightening of Dark Excitons and Trions in a WSe$_2$ Monolayer Krasucki, Grzegorz Slobodeniuk, Artur O. Walczyk, Kacper Olkowska-Pucko, Katarzyna Watanabe, Kenji Taniguchi, Takashi Babiński, Adam Molas, Maciej R. Mesoscale and Nanoscale Physics Materials Science Optically dark excitonic states play a critical role in the valleytronic, electronic, and optical properties of monolayer semiconducting transition metal dichalcogenides. Here, we investigate how electrostatic doping affects the in-plane magnetic-field-induced activation of dark excitonic complexes in a gated WSe$_2$ monolayer. By continuously tuning the carrier density via gate voltage, we access $n$-type, charge-neutral, and $p$-type regimes and track the corresponding brightening dynamics. We find that the brightening rates of the dark negative trion ($T^{D-}$), dark neutral exciton ($X^{D}$), and dark positive trion ($T^{D+}$) exhibit a strong and nontrivial dependence on doping. In particular, the pronounced asymmetry in the brightening behaviour of the neutral $X^{D}$ complex and the charged $T^{D-}$ and $T^{D+}$ trions reveals distinct underlying carrier interactions, which we describe using a rate-equation model for their steady-state populations. These findings highlight the key role of dark excitonic complexes in governing the optical response and carrier dynamics of doped S-TMD monolayers. |
| title | Doping-Induced Brightening of Dark Excitons and Trions in a WSe$_2$ Monolayer |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2604.25553 |