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

114 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

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Excitons
excitons
Kinetics
kinetics
interactions
Linewidth
Scattering
LDS 751
spectral sensitivity
scattering
Pumps
Spectroscopy
pumps
collisions
probes
spectroscopy
excitation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Sim, Sangwan ; Park, Jusang ; Song, Jeong Gyu ; In, Chihun ; Lee, Yun Shik ; Kim, Hyungjun ; Choi, Hyunyong. / Exciton dynamics in atomically thin MoS2 : Interexcitonic interaction and broadening kinetics. In: Physical Review B - Condensed Matter and Materials Physics. 2013 ; Vol. 88, No. 7.
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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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Exciton dynamics in atomically thin MoS2 : Interexcitonic interaction and broadening kinetics. / Sim, Sangwan; Park, Jusang; Song, Jeong Gyu; In, Chihun; Lee, Yun Shik; Kim, Hyungjun; Choi, Hyunyong.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 88, No. 7, 075434, 27.08.2013.

Research output: Contribution to journalArticle

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AU - Sim, Sangwan

AU - Park, Jusang

AU - Song, Jeong Gyu

AU - In, Chihun

AU - Lee, Yun Shik

AU - Kim, Hyungjun

AU - Choi, Hyunyong

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AB - 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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