  The magnetic field dependence of the excitonic states in unstrained
GaAs/AlGaAs quantum dots is investigated theoretically and experimentally. The
diamagnetic shift for the ground and the excited states are studied in magnetic
fields of varying orientation. In the theoretical study, calculations are
performed within the single band effective mass approximation, including band
nonparabolicity, the full experimental three-dimensional dot shape and the
electron-hole Coulomb interaction. These calculations are compared with the
experimental results for both the ground and the excited states in fields up to
50 Tesla. Good agreement is found between theory and experiment.
