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원자제어 저차원 전자계 연구단
원자제어 저차원 전자계 연구단
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1s-intraexcitonic dynamics in monolayer MoS2 probed by ultrafast mid-infrared spectroscopy

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Title
1s-intraexcitonic dynamics in monolayer MoS2 probed by ultrafast mid-infrared spectroscopy
Author(s)
Cha S.; Ji Ho Sung; Sim S.; Park J.; Hoseok Heo; Moon-Ho Jo; Choi H.
Publication Date
2016-02
Journal
NATURE COMMUNICATIONS, v.7, no., pp.10768 -
Publisher
NATURE PUBLISHING GROUP
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.
URI
http://pr.ibs.re.kr/handle/8788114/2460
DOI
10.1038/ncomms10768
ISSN
2041-1723
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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