Exciton dynamics in atomically thin MoS2: Interexcitonic interaction and broadening kinetics

Sangwan Sim, Jusang Park, Jeong Gyu Song, Chihun In, Yun Shik Lee, Hyungjun Kim, Hyunyong Choi

Research output: Contribution to journalArticle

121 Citations (Scopus)

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.

Original languageEnglish
Article number075434
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number7
DOIs
Publication statusPublished - 2013 Aug 27

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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