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Effects of Electronic Fourth-Order Correlations on the Pump–Probe Response of Semiconductors

✍ Scribed by U. Neukirch; S.R. Bolton; L.J. Sham; D.S. Chemla

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
113 KB
Volume
221
Category
Article
ISSN
0370-1972

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✦ Synopsis

The pump-and-probe response of a ZnSe quantum well is investigated. In this particular sample the binding energy far exceeds both the exciton damping and the inhomogeneous broadening. A comparison between experimental data and model calculations shows that with co-circularly polarized beams the nonlinear mean-field contributions dominate those induced by four-particle correlations. In contrast, only the four-particle correlations contribute to the signal in counter-circular configuration. For this configuration, the exciton±biexciton interaction dominates the response for resonant excitation of the exciton. The occurrence of exciton±biexciton transitions leads to a renormalization of the period of coherent oscillations at negative pulse delay.

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