Collective oscillations driven by correlation in the nonlinear optical regime
Abstract
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.
Cite
@article{arxiv.cond-mat/9910157,
title = {Collective oscillations driven by correlation in the nonlinear optical regime},
author = {Th. Oestreich and L. J. Sham},
journal= {arXiv preprint arXiv:cond-mat/9910157},
year = {2009}
}
Comments
4 pages, 4 figures, accepted for publication in Physical Review Letters