Nonequilibrium dynamics of high energy transitions in monolayer WSe$_{2}$
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866913155526950912 |
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| author | Dogadov, Oleg Cervantes-Villanueva, Jorge Olsen, Nicholas Trovatello, Chiara Zhu, Xiaoyang Cerullo, Giulio Molina-Sánchez, Alejandro Sangalli, Davide Conte, Stefano Dal |
| author_facet | Dogadov, Oleg Cervantes-Villanueva, Jorge Olsen, Nicholas Trovatello, Chiara Zhu, Xiaoyang Cerullo, Giulio Molina-Sánchez, Alejandro Sangalli, Davide Conte, Stefano Dal |
| contents | High-energy optical transitions in monolayer transition-metal dichalcogenides exhibit characteristics that are markedly distinct from those of lower-lying band-edge excitons. These differences arise from the involvement of electronic states located at regions of the Brillouin zone that are displaced from the $K$ valleys. In this work, we investigate the ultrafast dynamics of these high-energy excitations by employing broadband ultrafast transient absorption spectroscopy spanning the visible to ultraviolet spectral range. We observe that the formation and relaxation dynamics of one of the high energy transitions display a distinct behavior compared to the lower-energy excitonic resonances, developing on a significantly slower timescale. First-principles calculations of the excitonic landscape allow us to account for this delayed response and attribute it to the phonon-mediated formation of momentum-dark excitons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_23480 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Nonequilibrium dynamics of high energy transitions in monolayer WSe$_{2}$ Dogadov, Oleg Cervantes-Villanueva, Jorge Olsen, Nicholas Trovatello, Chiara Zhu, Xiaoyang Cerullo, Giulio Molina-Sánchez, Alejandro Sangalli, Davide Conte, Stefano Dal Materials Science High-energy optical transitions in monolayer transition-metal dichalcogenides exhibit characteristics that are markedly distinct from those of lower-lying band-edge excitons. These differences arise from the involvement of electronic states located at regions of the Brillouin zone that are displaced from the $K$ valleys. In this work, we investigate the ultrafast dynamics of these high-energy excitations by employing broadband ultrafast transient absorption spectroscopy spanning the visible to ultraviolet spectral range. We observe that the formation and relaxation dynamics of one of the high energy transitions display a distinct behavior compared to the lower-energy excitonic resonances, developing on a significantly slower timescale. First-principles calculations of the excitonic landscape allow us to account for this delayed response and attribute it to the phonon-mediated formation of momentum-dark excitons. |
| title | Nonequilibrium dynamics of high energy transitions in monolayer WSe$_{2}$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2605.23480 |