Magneto-photoluminescence study of electronic transitions in InAs/GaAs quantum dot layers

Magneto-photoluminescence of single- and multi-layered self-organised MOCVD grown InAs quantum dots in GaAs has been investigated at 77 K in magnetic fields up to B=27 T in Faraday configuration. From one up to six peaks are resolved at B=0 T in the photoluminescence spectra when the excitation intensity increases from 10 mW up to 1 W (514.5 nm line of Ar+ laser). Simple one particle Fock–Darwin model of two-dimensional electrons confined in a parabolic well describes satisfactorily the evolution of magneto-photoluminescence only for some peaks. The other peaks exhibit slight decrease in energy with increasing magnetic field (∼5 meV at 27 T).