Charge relaxation rate due to acoustic phonon in weakly confined quantum dot systems

We have studied phonon induced single electron relaxation rates in realistic models of weakly confined single and vertically coupled quantum dots. Piezoelectric interaction due to transverse acoustical phonons constituted the major source of scattering for small electron transition energies. For large gaps deformation potential interactions due to longitudinal acoustic phonons was observed. We have observed that proper structure deign made it possible to control the scattering rates of both single quantum dots and coupled quantum dots by orders of magnitudes. If we suppress the scattering rate in single quantum dots can be attained for moderately large lateral confinement. But in the case of coupled quantum dot structures permit to extend it down to fairly weak lateral confinement.