Influence of two-pair continuum correlations following resonant excitation of excitons |
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Authors: | Axt V M Haase B Neukirch U |
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Affiliation: | Institut für Festk?rpertheorie, Westf?lische Wilhelms Universit?t Münster, Wilhelm-Klemm-Strasse 10, D-48149 Münster, Germany. |
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Abstract: | 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. |
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