Abstract
The theory of the magnetooptical properties of highly excited quantum wells is reviewed with emphasis on recent experimental work in a collaboration led by the Chernogolovka group. Realistic numerical calculations strongly support the interpretation of the experimental magnetoluminescence spectra in terms of bound electron-hole pairs, but at the experimental plasma temperatures of ~40-50 K phase coherence and thus observation of the excitonic insulator state is not yet achieved. Important screening effects beyond the Hartree-Fock approximation exist even at magnetic fields of ~10T. At lower densities, evidence of dynamical screening of the electron-hole interaction is found.
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