Exciton dynamics in atomically thin MoS2: Interexcitonic interaction and broadening kinetics
- Authors
- Sim, Sangwan; Park, Jusang; Song, Jeong-Gyu; In, Chihun; Lee, Yun-Shik; Kim, Hyungjun; Choi, Hyunyong
- Issue Date
- Aug-2013
- Publisher
- AMER PHYSICAL SOC
- Citation
- Physical Review b, v.88, no.7, pp.1 - 5
- Indexed
- SCIE
SCOPUS
- Journal Title
- Physical Review b
- Volume
- 88
- Number
- 7
- Start Page
- 1
- End Page
- 5
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/27161
- DOI
- 10.1103/PhysRevB.88.075434
- ISSN
- 2469-9950
- Abstract
- We report ultrafast pump-probe spectroscopy examining exciton dynamics in atomically thin MoS2. Spectrally and temporally resolved measurements are performed to investigate the interaction dynamics of two important direct-gap excitons (A and B) and their associated broadening kinetics. The two excitons show strongly correlated interexcitonic dynamic, in which the transient blue-shifted excitonic absorption originates from the internal A-B excitonic interaction. The observed complex spectral response is determined by the exciton collision-induced linewidth broadening; the broadening of the B-exciton linewidth in turn lowers the peak spectral amplitude of the A exciton. Resonant excitation at the B-exciton energy reveals that interexcitonic scattering plays a more important role in determining the broadening kinetics than free-carrier scattering.
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