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

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  • 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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  • Sim, S., Park, J., Song, J., In, C., Lee, Y., Kim, H., & Choi, H. (2013). Exciton dynamics in atomically thin MoS2: Interexcitonic interaction and broadening kinetics. Physical Review B, 88(7) doi:10.1103/PhysRevB.88.075434
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  • 88
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  • 7
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  • The work at Yonsei was supported by Basic Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (Grant No. 2011-0013255), the NRF grant funded by the Korean government (MEST) (Grants No. NRF-2011-220-D00052, No. 2011-0028594, and No. 2011- 0032019), the Converging Research Center Program through the Ministry of Education, Science and Technology (Grant No. 2013K000173), and the LG Display academic industrial cooperation program. The work at Oregon State University was supported by the National Science Foundation (DMR- 1063632).
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  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2013-09-23T22:41:26Z No. of bitstreams: 1 LeeYun-ShikPhysicsExcitonDynamicsAtomically.pdf: 1013971 bytes, checksum: 881ad08b2d140cba738c4b0d1ea7fd77 (MD5)
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