Evidence of correlation in spin excitations of few-electron quantum dots
arXiv:cond-mat/0506143 · doi:10.1103/PhysRevLett.95.266806
Abstract
We report inelastic light scattering measurements of spin and charge excitations in nanofabricated AlGaAs/GaAs quantum dots with few electrons. A narrow spin excitation peak is observed and assigned to the intershell triplet-to-singlet monopole mode of dots with four electrons. Configurationinteraction theory provides precise quantitative interpretations that uncover large correlation effects that are comparable to exchange Coulomb interactions.
4 pages, 4 figures