Magneto-far-infrared studies of the hole cyclotron resonance and its associated subband exciton have been made for frequencies in the vicinity of the LO frequency. Just below ωLO a resonant exciton lifetime process is observed in which the hole-pocket subband exciton decays into the electron-pocket cyclotron resonance continuum via a virtual LO phonon. The experiments also give evidence for other phonon-mediated many-body processes.
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Baldwin et al. (1980) studied this question.
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