Abstract
The experimentally observed magnetic-field dependence of the integrated absorption coefficient in Al0.15Ga0.85As samples at 1.7 K is interpreted. It is established that the dependence results from the competition of two mechanisms: an increase in integrated absorption due to an increase in the oscillator strength as a result of magnetic-field-induced compression of the exciton wave function and a decrease associated with the magnetic freezing-out of charged scattering centers. An analysis of the integrated absorption shows that diamagnetic exciton polaritons are formed in the samples in a magnetic field.
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