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- W2159173695 abstract "We report our experimental and theoretical studies on the time-resolved dynamics of conduction electrons and coherentacoustic phonons (CAPs) in high quality GaN single crystals. Our measurements were performed using a two-color(ultraviolet and near-infrared), femtosecond, pump-probe spectroscopy by scanning the transient differential reflectivity(ΔR/R) signal of the probe beam. We have found that the threshold for the intervalley transition of electrons between theconduction band Γ and L valleys appears at the energy of 4.51 eV at 300 K and it increases to 4.57 eV at 100 K. Wehave also numerically simulated intervalley scattering dynamics and found that the characteristic scattering timeconstants were temperature independent and fitted extremely well our experimental data. The electron scattering timefrom the Γ to L valley was limited by the 150-fs width of our pump pulses, while the return process of electrons from Lto Γ was characterized by the scattering time of 1 ps, and the total depopulation time of the L valley was ~20 ps. On theexponentially decaying part of the ΔR/R transient, we have observed pronounced CAP oscillations with the intrinsiclifetime of at least 100 ns. The CAP amplitude was only dependent on the pump photon energy, while the oscillationfrequency was dispersionless (proportional to the probe-beam wave vector) with the slope (velocity of the acousticphonon propagation) determined by the speed of sound in GaN. The CAP characteristics agreed well with a developedtheoretical model." @default.
- W2159173695 created "2016-06-24" @default.
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- W2159173695 date "2008-02-07" @default.
- W2159173695 modified "2023-09-23" @default.
- W2159173695 title "Dynamics of intervalley transitions and propagation of coherent acoustic phonons in GaN single crystals studied by femtosecond pump-probe spectroscopy" @default.
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- W2159173695 doi "https://doi.org/10.1117/12.769522" @default.
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