Decoherence of Rabi oscillations in a single quantum dot

Details Decoherence of Rabi oscillations in a single quantum dot Decoherence of Rabi oscillations in a single quantum dot

2004-08-26

arxiv.org/abs/cond-mat/0408570v2

Phys. Rev. Lett 94, 057404 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.057404

We develop a realistic model of Rabi oscillations in a quantum-dot photodiode. Based in a multi-exciton density matrix formulation we show that for short pulses the two-level models 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 \emph{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.

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