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1s-intraexcitonic dynamics in monolayer MoS2 probed by ultrafast mid-infrared spectroscopy

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  • Soonyoung Cha

    (School of Electrical and Electronic Engineering, Yonsei University)

  • Ji Ho Sung

    (Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH))

  • Sangwan Sim

    (School of Electrical and Electronic Engineering, Yonsei University)

  • Jun Park

    (School of Electrical and Electronic Engineering, Yonsei University)

  • Hoseok Heo

    (Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH))

  • Moon-Ho Jo

    (Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH))

  • Hyunyong Choi

    (School of Electrical and Electronic Engineering, Yonsei University)

Abstract

The 1s exciton—the ground state of a bound electron-hole pair—is central to understanding the photoresponse of monolayer transition metal dichalcogenides. Above the 1s exciton, recent visible and near-infrared investigations have revealed that the excited excitons are much richer, exhibiting a series of Rydberg-like states. A natural question is then how the internal excitonic transitions are interrelated on photoexcitation. Accessing these intraexcitonic transitions, however, demands a fundamentally different experimental tool capable of probing optical transitions from 1s ‘bright’ to np ‘dark’ states. Here we employ ultrafast mid-infrared spectroscopy to explore the 1s intraexcitonic transitions in monolayer MoS2. We observed twofold 1s→3p intraexcitonic transitions within the A and B excitons and 1s→2p transition between the A and B excitons. Our results revealed that it takes about 0.7 ps for the 1s A exciton to reach quasi-equilibrium; a characteristic time that is associated with a rapid population transfer from the 1s B exciton, providing rich characteristics of many-body exciton dynamics in two-dimensional materials.

Suggested Citation

  • Soonyoung Cha & Ji Ho Sung & Sangwan Sim & Jun Park & Hoseok Heo & Moon-Ho Jo & Hyunyong Choi, 2016. "1s-intraexcitonic dynamics in monolayer MoS2 probed by ultrafast mid-infrared spectroscopy," Nature Communications, Nature, vol. 7(1), pages 1-7, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10768
    DOI: 10.1038/ncomms10768
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