Optical line-shape and the time-domain photon echo measurement in semiconductor quantum dots

It is shown theoretically that, because of the characteristic line-shape of the electronic spectral density, the experimental photon-echo signal, givi ng the dephasing of the electronic state of a quantum dot, should be modula ted in time quasi-periodically. This suggestion is demonstrated numerically for the case of Inks quantum dots for several temperatures of the sample. A comparison with the recent experiments on CdSe nanocrystals is presented. The theoretical argumentation is based on the recent theoretical calculati on of the homogeneous optical line-shape based on the multiple electron-LO- phonon scattering in quantum dots. (C) 2000 Elsevier Science B.V. All right s reserved.