Ruppert, Claudia and Chernikov, Alexey and Hill, Heather M. and Rigosi, Albert F. and Heinz, Tony F. (2017) The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation. NANO LETTERS, 17 (2). pp. 644-651. ISSN 1530-6984, 1530-6992
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Transient changes of the optical response of WS2 monolayers are studied by femtosecond broadband pump probe spectroscopy. Time-dependent absorption spectra are analyzed by tracking the line width broadening, bleaching, and energy shift of the main exciton resonance as a function of time delay after the excitation. Two main sources for the pump-induced changes of the optical response are identified. Specifically, we find an interplay between modifications induced by many-body interactions from photoexcited carriers and by the subsequent transfer of the excitation to the phonon system followed by cooling of the material through the heat transfer to the substrate.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL DICHALCOGENIDES; FEW-LAYER MOS2; MONO LAYER; BANDGAP RENORMALIZATION; MOLYBDENUM-DISULFIDE; EXCITON DYNAMICS; VALLEY; WSE2; SPIN; SEMICONDUCTOR; Atomically thin 2D materials; ultrafast spectroscopy; carrier and phonon dynamics |
| Subjects: | 500 Science > 530 Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:01 |
| Last Modified: | 19 Feb 2019 15:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/495 |
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