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

Title
1s intraexcitonic dynamics in monolayer MoS2 probed by ultrafast mid-infrared spectroscopy
Author
심상완
Keywords
TRANSITION-METAL DICHALCOGENIDES; GIANT BANDGAP RENORMALIZATION; GAAS QUANTUM-WELLS; SINGLE-LAYER MOS2; MONO LAYER; TUNGSTEN DISULFIDE; CARRIER DYNAMICS; STATES; HETEROSTRUCTURES; WSE2
Issue Date
2016-02
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v. 7, Article no. 10768
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
https://www.nature.com/articles/ncomms10768http://repository.hanyang.ac.kr/handle/20.500.11754/100555
ISSN
2041-1723
DOI
10.1038/ncomms10768
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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