Resonant intervalley scattering in GaAs

Abstract

The dynamics of intervalley scattering of electrons is investigated in GaAs with 6 fs optical pulses at room temperature. We report the observation of a ``resonant coupling'' between the \ensuremath{\Gamma} and X conduction bands. This effect slows the apparent rate of scattering of carriers in the \ensuremath{\Gamma} valley at energies near the minimum of the X valley.