Abstract

Hot electron to neutral acceptor (e, A0) photoluminescence from GaAs in strong magnetic fields up to 13 T is reported for the first time. The observed phonon cascade, and the changes in the emission arising from hot electrons recombining immediately after excitation, suggest that electrons relax by phonon-assisted scattering between bands dispersing freely in kZ and stacked onto Landau levels. A small lineshift is observed, which can be explained quantitatively when non-parabolicities are taken into account, as is shown by separate measurements and with a k.p band structure calculation.

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