Abstract
Three new experiments are described which quantify the interaction of high-frequency phonons with the electron-hole liquid. Drift measurements in Si have determined the mobility of electron-hole droplets (EHD) and shown a temperature dependence of the electron-phonon scattering rate which is characteristic of a degenerate Fermi fluid. The drift velocity of EHD strongly saturates at near-sonic velocities, suggesting a Cherenkov-like phonon emission. Phonon spectroscopy in the 150–500 GHz range has determined the dynamic deformation potential and demonmstrated the predicted 2kF-cutoff in the absorption of phonons by EHD in Ge. Time-resolved luminescence imaging has revealed an interesting phonon-wind-induced anisotropy in a cloud of electron-hole droplets which is produced by intense pulsed-laser excitation of Ge.
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