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

Collection with item attached
2016
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/473409.do
DOI
10.1038/ncomms10768
Title
1s-intraexcitonic dynamics in monolayer MoS2 probed by ultrafastmid-infrared spectroscopy
Description
S. Cha, S. Sim, J. Park and H. Choi were supported by the NationalResearch Foundation of Korea (NRF) through the government of Korea(MSIP) (Grants No. NRF-2011-0013255, NRF-2009-0083512,NRF-2015R1A2A1A10052520), Global Frontier Program (2014M3A6B3063709),the Yonsei University Yonsei-SNU Collaborative Research Fund of 2014 andthe Yonsei University Future-leading Research Initiative of 2014.J.H.S., H.H. and M.-H.J. were supported by Institute for Basic Science(IBS), Korea under the contract number of IBS-R014-G1-2016-a00.
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 midinfrared 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.
provenance
Made available in Cube on 2018-09-28T10:18:44Z (GMT). No. of bitstreams: 0
language
English
author
Cha, Soonyoung
Sung, Ji Ho
Sim, Sangwan
Park, Jun
Heo, Hoseok
Jo, Moon-Ho
Choi, Hyunyong
orcid
Jo, Moon-Ho/0000-0002-3160-358X
accessioned
2018-09-28T10:18:44Z
available
2018-09-28T10:18:44Z
issued
2016
citation
NATURE COMMUNICATIONS(7)
issn
2041-1723
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/473409.do
Funder
미래창조과학부
Funding Program
기초과학연구원연구운영비지원
Project ID
1711045939
Jurisdiction
Rep.of Korea
Project Name
Investigation of electronic properties of atomically controlled artificial low dimensional electronic systems
rights
openAccess
type
article


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