Slow Cooling of High‐Energy C Excitons Is Limited by Intervalley‐Transfer in Monolayer MoS2

High‐energy C exciton in 2D transition metal dichalcogenides with strong photon absorption can be utilized prospectively in light‐harvesting and opto‐electric devices. Here, a detailed study on C exciton dynamics in monolayer MoS2 is presented by femtosecond transient absorption (TA) spectroscopy. I...

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Bibliographic Details
Published in:Laser & photonics reviews 2019-04, Vol.13 (4), p.n/a
Main Authors: Li, Yuanzheng, Shi, Jia, Chen, Heyu, Mi, Yang, Du, Wenna, Sui, Xinyu, Jiang, Chuanxiu, Liu, Weizhen, Xu, Haiyang, Liu, Xinfeng
Format: Article
Language:English
Subjects:
C excitons
Cooling
Cooling rate
Electric devices
Excitons
Fluence
intervalley transfer
Molybdenum disulfide
Monolayers
MoS2
Photon absorption
Spectroscopy
Spectrum analysis
Temperature
transient absorption
Transition metal compounds
ultrafast cooling
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Summary:High‐energy C exciton in 2D transition metal dichalcogenides with strong photon absorption can be utilized prospectively in light‐harvesting and opto‐electric devices. Here, a detailed study on C exciton dynamics in monolayer MoS2 is presented by femtosecond transient absorption (TA) spectroscopy. In the experiment, the C exciton with unique parallel band structure exhibits a slow process within tens of picoseconds (≈10–50 ps) as well as a fast process within several picoseconds (≈1–6 ps) instead of previous reported ultrafast cooling (
ISSN:1863-8880
1863-8899
DOI:10.1002/lpor.201800270