ELECTRON-PLASMON RELAXATION IN QUANTUM-WELLS WITH INVERTED SUBBAND OCCUPATION

We have considered the electron-plasmon interaction and intersubband r esonance screening in a quantum well with inverted subband occupation. We show that in such a system the intersubband plasmon emission leads to an efficient deexcitation of the nonequilibrium initial state and raises the occupation of states at the lower-subband bottom. Downshift and resonance narrowing of the intersubband optical emission spectra are obtained and shown to be influenced by the process of intersubband plasmon excitation. (C) 1998 American Institute of Physics. [S0003-69 51(98)01841-5].