Answers are grounded in this paper and cite their sources.
Nondegenerate four-wave-mixing allows one to monitor the femtosecond relaxation of free carriers in GaAs and CdTe at densities as low as 2×10¹⁵ cm^-3. The energy relaxation time of electrons via LO-phonon emission is determined to be 240±20 fs in GaAs. In more polar CdTe, this time constant is found to be as short as 70±15 fs which is even shorter than the phonon oscillation period of 200 fs.
No takes yet. Share an insight, caveat, or question.
Betz et al. (1999) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: