Collective oscillations driven by correlation in the nonlinear optical regime

Details Collective oscillations driven by correlation in the nonlinear optical regime Collective oscillations driven by correlation in the nonlinear optical regime

1999-10-11

arxiv.org/abs/cond-mat/9910157v1

Physics

Condensed Matter

4 pages, 4 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.83.3510

We present an analytical and numerical study of the coherent exciton polarization including exciton-exciton correlation. The time evolution after excitation with ultrashort optical pulses can be divided into a slowly varying polarization component and novel ultrafast collective modes. The frequency and damping of the collective modes are determined by the high-frequency properties of the retarded two-exciton correlation function, which includes Coulomb effects beyond the mean-field approximation. The overall time evolution depends on the low-frequency spectral behavior. The collective mode, well separated from the slower coherent density evolution, manifests itself in the coherent emission of a resonantly excited excitonic system, as demonstrated numerically.

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