Ultrafast non-linear optical signal from a single quantum dot: exciton and biexciton effects

Details Ultrafast non-linear optical signal from a single quantum dot: exciton and biexciton effects Ultrafast non-linear optical signal from a single quantum dot: exciton and biexciton effects

2002-08-29

arxiv.org/abs/cond-mat/0208588v2

Journal of Physics: Condensed Matter 16 6185 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 3 figures

Scientific paper

10.1088/0953-8984/16/34/017

We present results on both the intensity and phase-dynamics of the transient non-linear optical response of a single quantum dot (SQD). The time evolution of the Four Wave Mixing (FWM) signal on a subpicosecond time scale is dominated by biexciton effects. In particular, for the cross-polarized excitation case a biexciton bound state is found. In this latter case, mean-field results are shown to give a poor description of the non-linear optical signal at small times. By properly treating exciton-exciton effects in a SQD, coherent oscillations in the FWM signal are clearly demonstrated. These oscillations, with a period corresponding to the inverse of the biexciton binding energy, are correlated with the phase dynamics of the system's polarization giving clear signatures of non-Markovian effects in the ultrafast regime.

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