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• W2360576827 abstract "We report on transient absorption experiments performed at high optical excitation fluences and used to study the ultrafast dynamics in graphene. We employed a degenerated scheme of pump and probe at 800 nm (1.55 eV). The time resolution of our measurements was limited by the pulse duration ~ 100 fs. The samples were prepared by chemical vapor deposition (CVD) as single-layers on silica and, then staked layer-by-layer in order to make a stack of up to 5 graphene monolayers. We observed saturable absorption (SA) and fluence-dependent relaxation times. We see that the ultrafast carrier dynamics is composed by two decay mechanisms, one with response time of about 200 fs and a slower process of about 1 ps. The fast decay, due to both carrier-carrier and carrier-optical phonon scattering, becomes slower when the density of excited carrier was increased. We implemented a theoretical model and found that both the optical phonon rate emission and the optical phonon lifetime are affect by the pump fluence." @default.
• W2360576827 created "2016-06-24" @default.
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• W2360576827 date "2016-05-13" @default.
• W2360576827 modified "2023-10-03" @default.
• W2360576827 title "Effect of high-optical excitation on the ultrafast electron dynamics in stacked-monolayer graphene samples" @default.
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• W2360576827 doi "https://doi.org/10.1117/12.2235501" @default.
• W2360576827 hasPublicationYear "2016" @default.
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