Correlation versus mean-field contributions to excitons, multi-excitons,   and charging energies in semiconductor quantum dots
  Single-dot spectroscopy is now able to resolve the energies of excitons, multi-excitons, and charging of semiconductor quantum dots with ~<1 meV resolution. We discuss the physical content of these energies and show how they can be calculated via Quantum Monte Carlo (QMC) and Configuration Interaction (CI) methods. 
J. Shumway, A. Franceschetti, and Alex Zunger