Polarons in semiconductor quantum-dots and their role in the quantum   kinetics of carrier relaxation
  While time-dependent perturbation theory shows inefficient carrier-phonon scattering in semiconductor quantum dots, we demonstrate that a quantum kinetic description of carrier-phonon interaction predicts fast carrier capture and relaxation. The considered processes do not fulfill energy conservation in terms of free-carrier energies because polar coupling of localized quantum-dot states strongly modifies this picture. 
J. Seebeck, T. R. Nielsen, P. Gartner, F. Jahnke