Hao, Kai and Xu, Lixiang and Nagler, Philipp and Singh, Akshay and Kha Tran, and Dass, Chandriker Kavir and Schueller, Christian and Korn, Tobias and Li, Xiaoqin and Moody, Galan (2016) Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2. NANO LETTERS, 16 (8). pp. 5109-5113. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
The optical properties of semiconducting transition metal dichalcogenides are dominated by both neutral excitons (electron hole pairs) and charged excitons (trions) that are stable even at room temperature. While trions directly influence charge transport properties in optoelectronic devices, excitons may be relevant through exciton-trion coupling and conversion phenomena. In this work, we reveal the coherent and incoherent nature of exciton-trion coupling and the relevant time scales in monolayer MoSe2 using optical two-dimensional coherent spectroscopy. Coherent interaction between excitons and trions is definitively identified as quantum beating of cross peaks in the spectra that persists for a few hundred femtoseconds. For longer times up to 10 ps, surprisingly, the relative intensity of the cross peaks increases, which is attributed to incoherent energy transfer likely due to phonon-assisted up-conversion and down-conversion processes that are efficient even at cryogenic temperature.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL DICHALCOGENIDES; GAAS QUANTUM-WELLS; VALLEY COHERENCE; ENERGY-TRANSFER; BEATS; WSE2; SEMICONDUCTOR; SPECTROSCOPY; LASER; PHOTOLUMINESCENCE; Quantum beats; coherent coupling; exciton; trion; two-dimensional materials |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Apr 2019 07:17 |
| Last Modified: | 08 Apr 2019 07:17 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3585 |
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