Journal
NANO LETTERS
Volume 17, Issue 2, Pages 644-651Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b03513
Keywords
Atomically thin 2D materials; ultrafast spectroscopy; carrier and phonon dynamics
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Funding
- Air Force Office of Scientific Research [FA9550-14-1-0268]
- Deutsche Forschungsgemeinschaft (DFG) within the Emmy Noether Research Group program [CH 1672/1-1]
- Keck Foundation
- Alexander von Humboldt Foundation within the Feodor Lynen Research Fellowship program
- National Science Foundation [DGE-1069240, DGE-1144155]
- DFG [SFB TRR142]
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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.
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