Estimating the Memory Time Induced by Exciton-Exciton Scattering

Title data

Axt, Vollrath Martin ; Kuhn, Tilmann ; Haase, B. ; Neukirch, U. ; Gutowski, Jürgen:
Estimating the Memory Time Induced by Exciton-Exciton Scattering.
In: Physical Review Letters. Vol. 93 (2004) Issue 12 . - 127402.
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.93.127402

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Abstract in another language

It is shown that lower bounds for the effective memory time induced by two-pair correlations can be estimated by monitoring changes of the shape of excitonic four-wave-mixing spectra. Experimentally we demonstrate a memory time of at least 540 fs for a ZnSe single quantum well. Microscopic calculations reveal that this lower bound is not sharp. Interactions retarded by more than 800 fs are shown to influence the dynamics, reflecting the presence of a long time tail in the memory kernel.