Evidence of correlation in spin excitations of few-electron quantum dots
  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. 
Cesar Pascual Garcia, Vittorio Pellegrini, Aron Pinczuk, Massimo   Rontani, Guido Goldoni, Elisa Molinari, Brian S. Dennis, ...