Influence of two-pair continuum correlations following resonant excitation of excitons

The memory structure induced by coherent transitions to the exciton-exciton scattering continuum is shown to have significant influence on spectrally resolved four-wave-mixing signals even under selective excitation of 1s excitons. Comparisons between experiments and calculations that account nonper...

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Bibliographic Details
Published in:Physical review letters 2001-05, Vol.86 (20), p.4620-4623
Main Authors: Axt, V M, Haase, B, Neukirch, U
Format: Article
Language:English
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Summary:The memory structure induced by coherent transitions to the exciton-exciton scattering continuum is shown to have significant influence on spectrally resolved four-wave-mixing signals even under selective excitation of 1s excitons. Comparisons between experiments and calculations that account nonperturbatively for these quantum kinetic Coulomb correlations demonstrate large compensations between mean-field contributions and transitions to the two-pair continuum. Experiments with different polarizations of the laser pulses show that two-pair continuum correlations are responsible for delay-time dependent shifts of the excitonic emission as well as for substantial deformations of the line shape.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.86.4620