Rosati, Roberto and Wagner, Koloman and Brem, Samuel and Perea-Causin, Raul and Wietek, Edith and Zipfel, Jonas and Ziegler, Jonas D. and Selig, Malte and Taniguchi, Takashi and Watanabe, Kenji and Knorr, Andreas and Chernikov, Alexey and Malic, Ermin (2020) Temporal Evolution of Low-Temperature Phonon Sidebands in Transition Metal Dichalcogenides. ACS PHOTONICS, 7 (10). pp. 2756-2764. ISSN 2330-4022,
Full text not available from this repository. (Request a copy)Abstract
Low-temperature photoluminescence (PL) of hBN-encapsulated monolayer tungsten diselenide (WSe2) shows a multitude of sharp emission peaks below the bright exciton. Some of them have been recently identified as phonon sidebands of momentum-dark states. However, the exciton dynamics behind the emergence of these sidebands has not been revealed yet. In this joint theory-experiment study, we theoretically predict and experimentally observe time-resolved PL, providing microscopic insights into the thermalization of hot excitons formed after optical excitation. In very good agreement between theory and experiment, we demonstrate a spectral red-shift of phonon sidebands on a time scale of tens of picoseconds, reflecting the phonon-driven thermalization of hot excitons in momentum-dark states. Furthermore, we predict the emergence of a transient phonon sideband that vanishes in the stationary PL. The obtained microscopic insights are applicable to a broad class of 2D materials with multiple exciton valleys.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | INDIRECT INTERLAYER EXCITONS; SEMICONDUCTOR; PHOTOLUMINESCENCE; MONOLAYER; formation of phonon sidebands; dark excitons; transition metal dichalcogenides |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Junior Research Group Alexey Chernikov |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Mar 2021 13:44 |
| Last Modified: | 08 Mar 2021 13:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/43532 |
Actions (login required)
 |
View Item |
