Magneto-optical spectra of strongly correlated electrons in nonparabolic quantum dots

By directly diagonalizing the many-body interacting Hamiltonian for two-model confinement potentials, we calculate the dipole-allowed optical-transition spectra for a few electrons confined in a small quantum dot subjected to a strong external magnetic field. We find substantial and qualitative many-body corrections to the optical-transition energies for quartic and flat-bottomed parabolic confinement in contrast to the well-studied purely parabolic confinement where optical transitions are known to be unaffected by interaction effects by virtue of the generalized Kohn’s theorem. We predict strong nonmonotonic structures as a function of the magnetic field in the magneto-optical excitation energy spectrum.