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- W2293173772 abstract "We study the exciton valley relaxation dynamics in single-layer MoS2 by a combination of two nonequilibrium optical techniques: time-resolved Faraday rotation and time-resolved circular dichroism. The depolarization dynamics, measured at 77 K, exhibits a peculiar biexponential decay, characterized by two distinct time scales of 200 fs and 5 ps. The fast relaxation of the valley polarization is in good agreement with a model including the intervalley electron-hole Coulomb exchange as the dominating mechanism. The valley relaxation dynamics is further investigated as a function of temperature and photoinduced exciton density. We measure a strong exciton density dependence of the transient Faraday rotation signal. This indicates the key role of exciton-exciton interactions in MoS2 valley relaxation dynamics." @default.
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- W2293173772 date "2015-12-14" @default.
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- W2293173772 title "Ultrafast valley relaxation dynamics in monolayer<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>MoS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>probed by nonequilibrium optical techniques" @default.
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- W2293173772 doi "https://doi.org/10.1103/physrevb.92.235425" @default.
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