Abstract
The Energy Loss Rate (ELR) of electrons in quantum wells, due to polar interaction with bulk longitudinal optical (LO) phonons is calculated, including the effect of dynamical screening of the electron-LO phonon interaction. The effect of a nonequilibrium distribution of LO phonons (“hot phonons”) is included via a relaxation time approximation, keeping the relaxation time as a parameter. Numerical results are given for GaAs quantum wells, for the range of parameters (quantum well size, electron temperature, electron density) relevant to recent experimental determinations. The dynamical screening, which is a natural consequence of the energy-balance equations used, is shown to be particularly relevant to the electron density dependence.
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