Hofmann, Niklas and Weigl, Leonard and Gradl, Johannes and Mishra, Neeraj and Orlandini, Giorgio and Forti, Stiven and Coletti, Camilla and Latini, Simone and Xian, Lede and Rubio, Angel and Paredes, Dilan Perez and Causin, Raul Perea and Brem, Samuel and Malic, Ermin and Gierz, Isabella (2023) Link between interlayer hybridization and ultrafast charge transfer in WS2-graphene heterostructures. 2D MATERIALS, 10 (3): 035025. ISSN 2053-1583,
Full text not available from this repository. (Request a copy)Abstract
Ultrafast charge separation after photoexcitation is a common phenomenon in various van-der-Waals (vdW) heterostructures with great relevance for future applications in light harvesting and detection. Theoretical understanding of this phenomenon converges towards a coherent mechanism through charge transfer states accompanied by energy dissipation into strongly coupled phonons. The detailed microscopic pathways are material specific as they sensitively depend on the band structures of the individual layers, the relative band alignment in the heterostructure, the twist angle between the layers, and interlayer interactions resulting in hybridization. We used time- and angle-resolved photoemission spectroscopy combined with tight binding and density functional theory electronic structure calculations to investigate ultrafast charge separation and recombination in WS2-graphene vdW heterostructures. We identify several avoided crossings in the band structure and discuss their relevance for ultrafast charge transfer. We relate our own observations to existing theoretical models and propose a unified picture for ultrafast charge transfer in vdW heterostructures where band alignment and twist angle emerge as the most important control parameters.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | WAALS; SEPARATION; van-der-Waals heterostructures; ultrafast charge transfer; time- and angle-resolved photoemission spectroscopy; tight binding band structure calculations; density functional theory |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Prof. Dr. Isabella Gierz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Mar 2024 12:46 |
| Last Modified: | 13 Mar 2024 12:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/59924 |
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