k-resolved ultrafast light-induced band renormalization in monolayer WS$_2$ on graphene
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912257328283648 |
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| author | Hofmann, Niklas Steinhoff, Alexander Krause, Razvan Mishra, Neeraj Orlandini, Giorgio Forti, Stiven Coletti, Camilla Wehling, Tim O. Gierz, Isabella |
| author_facet | Hofmann, Niklas Steinhoff, Alexander Krause, Razvan Mishra, Neeraj Orlandini, Giorgio Forti, Stiven Coletti, Camilla Wehling, Tim O. Gierz, Isabella |
| contents | Understanding and controlling the electronic properties of two-dimensional materials is crucial for their potential applications in nano- and optoelectronics. Monolayer transition metal dichalcogenides such as WS$_2$ have garnered significant interest due to their strong light-matter interaction and extreme sensitivity of the band structure to the presence of photogenerated electron-hole pairs. In this study, we investigate the transient electronic structure of monolayer WS$_2$ on a graphene substrate after resonant excitation of the A-exciton using time- and angle-resolved photoemission spectroscopy. We observe a pronounced band structure renormalization including a substantial reduction of the transient band gap that is in good quantitative agreement with our {\it ab initio} theory that reveals the importance of both intrinsic WS$_2$ and extrinsic substrate contributions to the transient band structure of monolayer WS$_2$. Our findings not only deepen the fundamental understanding of band structure dynamics in two-dimensional materials but also offer valuable insights for the development of novel electronic and optoelectronic devices based on monolayer TMDs and their heterostructures with graphene. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_01371 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | k-resolved ultrafast light-induced band renormalization in monolayer WS$_2$ on graphene Hofmann, Niklas Steinhoff, Alexander Krause, Razvan Mishra, Neeraj Orlandini, Giorgio Forti, Stiven Coletti, Camilla Wehling, Tim O. Gierz, Isabella Materials Science Understanding and controlling the electronic properties of two-dimensional materials is crucial for their potential applications in nano- and optoelectronics. Monolayer transition metal dichalcogenides such as WS$_2$ have garnered significant interest due to their strong light-matter interaction and extreme sensitivity of the band structure to the presence of photogenerated electron-hole pairs. In this study, we investigate the transient electronic structure of monolayer WS$_2$ on a graphene substrate after resonant excitation of the A-exciton using time- and angle-resolved photoemission spectroscopy. We observe a pronounced band structure renormalization including a substantial reduction of the transient band gap that is in good quantitative agreement with our {\it ab initio} theory that reveals the importance of both intrinsic WS$_2$ and extrinsic substrate contributions to the transient band structure of monolayer WS$_2$. Our findings not only deepen the fundamental understanding of band structure dynamics in two-dimensional materials but also offer valuable insights for the development of novel electronic and optoelectronic devices based on monolayer TMDs and their heterostructures with graphene. |
| title | k-resolved ultrafast light-induced band renormalization in monolayer WS$_2$ on graphene |
| topic | Materials Science |
| url | https://arxiv.org/abs/2405.01371 |