Dinh Van Tuan, and Scharf, Benedikt and Wang, Zefang and Shan, Jie and Mak, Kin Fai and Zutic, Igor and Dery, Hanan (2019) Probing many-body interactions in monolayer transition-metal dichalcogenides. PHYSICAL REVIEW B, 99 (8): 085301. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
Many-body interactions in monolayer transition-metal dichalcogenides are strongly affected by their unique band structure. We study these interactions by measuring the energy shift of neutral excitons (bound electron-hole pairs) in gated WSe2 and MoSe2. Surprisingly, while the blueshift of the neutral exciton X-0 in electron-doped samples can be more than 10 meV, the blueshift in hole-doped samples is nearly absent. Taking into account dynamical screening and local-field effects, we present a transparent and analytical model that elucidates the crucial role played by intervalley plasmons in electron-doped conditions. The energy shift of X-0 as a function of charge density is computed showing agreement with experiment, where the renormalization of X-0 by intervalley plasmons yields a stronger blueshift in MoSe2 than in WSe2 due to differences in their band ordering.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRONIC-PROPERTIES; OPTICAL-PROPERTIES; DARK EXCITONS; SEMICONDUCTOR; WSE2; SPIN; OPTOELECTRONICS; GENERATION; BIEXCITONS; ABSORPTION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 20 Apr 2020 06:57 |
| Last Modified: | 20 Apr 2020 06:57 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27663 |
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