All-optical quantum coherent control of electron spin in semiconductor quantum dots

摘要

We develop and apply a new dynamical model for rigorous description of circularly (elliptically) polarized ultrashort optical pulse interactions with the resonant nonlinearities in semiconductor optical waveguides. The method is based on selfconsistent solution in the time domain of the vector Maxwell equations for electromagnetic wave propagation coupled via macroscopic polarization to the coherent time-evolution equations of a discrete N-level system in terms of the real pseudospin (coherence) vector. We investigate theoretically tie optically-induced ultrafast resonant coherent spin dynamics in a singly charged semiconductor quantum dot Onset of Rabi oscillations at sufficiently high excitation intensifies is demonstrated numerically resulting in suppression of the spin relaxation and a longer decay time of the polarized photoluminescence.