Hofmann, Niklas and Steinhoff, Alexander and Krause, Razvan and Mishra, Neeraj and Orlandini, Giorgio and Forti, Stiven and Coletti, Camilla and Wehling, Tim O. and Gierz, Isabella (2025) k-Resolved Ultrafast Light-Induced Band Renormalization in Monolayer WS2 on Graphene. NANO LETTERS, 25 (3). pp. 1214-1219. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
Understanding and controlling the electronic properties of two-dimensional materials are crucial for their potential applications in nano- and optoelectronics. Monolayer transition metal dichalcogenides 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 WS2 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 in good quantitative agreement with our ab initio theory, revealing the importance of both intrinsic WS2 and extrinsic substrate contributions. Our findings deepen the fundamental understanding of band structure dynamics in two-dimensional materials and offer valuable insights for the development of novel electronic and optoelectronic devices based on monolayer TMDs and their heterostructures with graphene.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRONIC-PROPERTIES; TUNGSTEN DISULFIDE; monolayer transitionmetal dichalcogenides; time- andangle-resolved photoemission spectroscopy; band gap renormalization; dielectric screening; ab initio calculations; nonequilibrium Green functions |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Prof. Dr. Isabella Gierz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Jun 2026 05:54 |
| Last Modified: | 24 Jun 2026 05:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66831 |
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