Abstract

We have studied non-equilibrium electron distributions and electron-longitudinal optical phonon scattering rates in wurtzite GaN by subpicosecond time-resolved Raman spectroscopy. Our experimental result show that for electron densities n greater than or equal to 5 X 1017 cm-3, the non-equilibrium electron distributions in wurtzite GaN can be very well described by Fermi-Dirac distribution functions with the effective electron temperature much higher than the lattice temperature. In addition, we find that the total electron-longitudinal optical phonon scattering rate in GaN is about one order of magnitude larger than that in GaAs. We attribute this enormous increase in the electron- longitudinal optical phonon scattering rate to the much larger ionicity in GaN.

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