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Strong increase in the intensity of the peaks of excited magneto-exciton (ME)states in the photoluminescence excitation (PLE) spectra recorded for theground heavy-hole magneto-excitons (of the 1sHH type) has been found in aGaAs/AlGaAs superlattice in strong magnetic field B applied normal to thesample layers. While varying B the intensities of the PLE peaks have beenmeasured as functions of energy separation $\Delta E$ between excited ME peaksand the ground state of the system. The resonance profiles have been found tohave maxima at $\Delta E_{\rm max}$ close to the energy of the GaAs LO-phonon.However, the value of $\Delta E_{\rm max}$ depends on quantum numbers of theexcited ME state. The revealed very low quantum efficiency of the investigatedsample allows us to ascribe the observed resonance to the enhancement of thenon-radiative magneto-exciton relaxation rate arising due to LO-phononemission. The presented theoretical model, being in a good agreement withexperimental observations, provides a method to extract 1sHH magneto-exciton``in-plane" dispersion from the dependence of $\Delta E_{\rm max}$ on theexcited ME state quantum numbers.

Magneto-phonon resonance in photoluminescence excitation spectra of magneto-excitons in GaAs/AlGaAs Superlattices