Covre, F. S. and Faria, P. E. and Gordo, V. O. and de Brito, C. Serati and Zhumagulov, Y. and Teodoro, M. D. and Couto, O. D. D. and Misoguti, L. and Pratavieira, S. and Andrade, M. B. and Christianen, P. C. M. and Fabian, J. and Withers, F. and Gobato, Y. Galvao (2022) Revealing the impact of strain in the optical properties of bubbles in monolayer MoSe2. NANOSCALE, 14 (15). pp. 5758-5768. ISSN 2040-3364, 2040-3372
Full text not available from this repository. (Request a copy)Abstract
Strain plays an important role for the optical properties of monolayer transition metal dichalcogenides (TMDCs). Here, we investigate strain effects in a monolayer MoSe2 sample with a large bubble region using mu-Raman, second harmonic generation (SHG), mu-photoluminescence and magneto mu-photoluminescence at low temperature. Remarkably, our results reveal the presence of a non-uniform strain field and the observation of emission peaks at lower energies which are the signatures of exciton and trion quasiparticles red-shifted by strain effects in the bubble region, in agreement with our theoretical predictions. Furthermore, we have observed that the emission in the strained region decreases the trion binding energy and enhances the valley g-factors as compared to non-strained regions. Considering uniform biaxial strain effects within the unit cell of the TMDC monolayer (ML), our first principles calculations predict the observed enhancement of the exciton valley Zeeman effect. In addition, our results suggest that the exciton-trion fine structure plays an important role for the optical properties of strained TMDC ML. In summary, our study provides fundamental insights on the behaviour of excitons and trions in strained monolayer MoSe2 which are particularly relevant to properly characterize and understand the fine structure of excitonic complexes in strained TMDC systems/devices.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM EMITTERS; HETEROSTRUCTURES; VECTOR; PMMA; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Feb 2024 07:15 |
| Last Modified: | 02 Feb 2024 07:15 |
| URI: | https://pred.uni-regensburg.de/id/eprint/58265 |
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