Damping and restoration of nonlinear Rabi oscillations in the three-level atomic model

Paulo Aguiar Brandão

Dmitri S. Mogilevtsev, A.P. Nisovtsev, S. Ya. Kilin +3 more

Amitabh Joshi, S. V. Lawande

We have presented the exact solution of the density matrix equation under the dressed-atom approximation for an isolated atom interacting with a single mode of cavity which has non-zero damping via a nonlinear interaction with reservoir. These solutions are then used to study the phenomenon of collapses and revivals of Rabi oscillations in the atom.

А. В. Леонов, И. Д. Феранчук

J. M. Villas-Bôas, Sergio E. Ulloa, Alexander O. Govorov

We develop a realistic model of Rabi oscillations in a quantum-dot photodiode. Based in a multiexciton density matrix formulation we show that for short pulses the two-level model fails and higher levels should be taken into account. This affects some of the experimental conclusions, such as the inferred efficiency of the state rotation (population inversion) and the deduced value of the dipole interaction. We also show that the damping observed cannot be explained using constant rates with fixed pulse duration. We demonstrate that the damping observed is in fact induced by an off-resonant excitation to or from the continuum of wetting layer states. Our model describes the nonlinear decoherence behavior observed in recent experiments.

И. Д. Феранчук, А. В. Леонов