Influence of Two-Pair Continuum Correlations Following Resonant Excitation of Excitons

Titelangaben

Axt, Vollrath Martin ; Haase, B. ; Neukirch, U.:
Influence of Two-Pair Continuum Correlations Following Resonant Excitation of Excitons.
In: Physical Review Letters. Bd. 86 (2001) Heft 20 . - S. 4620-4623.
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.86.4620

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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.