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• W2122523145 abstract "Time-resolved second harmonic generation (SHG) was used to study hot carrier dynamics at the Ge(111)−GeO2 interface on the femtosecond time scale. A linear dependence of the change in SHG on the pump power was observed for the carrier density range of 3 × 1018 to 2.2 × 1019 cm-3. The ratio of the hot carrier to valence band nonlinear susceptibilities was determined to be 924 ± 40 in the Ge(111)−GeO2 system, an order of magnitude greater than for Si(111)−SiO2. The dynamic SHG response is attributed to a change in the nonlinear susceptibility of the excited carriers and the diffusion of excited carriers away from the interface. The time to reach SHG steady-state response (410 ± 70 fs) appears independent of carrier density in the range explored. The time evolution of the hot carrier nonlinear susceptibilities for Ge(111)−GeO2 at the 2 azimuth was extracted and shown to follow a double exponential evolution with time constants of 170 ± 50 fs and 3500 ± 1450 fs, similar to the literature values for bulk scattering times of electrons out of the Γ valley (∼100 fs) and into the L valley (∼3.7 ps)." @default.
• W2122523145 created "2016-06-24" @default.
• W2122523145 creator A5051180410 @default.
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• W2122523145 date "2004-03-01" @default.
• W2122523145 modified "2023-10-17" @default.
• W2122523145 title "Ultrafast Time-Evolution of the Nonlinear Susceptibility of Hot Carriers at the Ge(111)−GeO₂ Interface As Probed by SHG" @default.
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• W2122523145 doi "https://doi.org/10.1021/jp036231k" @default.
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