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The Importance of Biexcitons in Four-Wave Mixing Experiments in Quantum Wells with Interface Disorder

Gabriele Bongiovanni, Andrea Mura, D. Leadley, Francesco Quochi, Steffen Gurtler, Jean Louis Staehli

Published Jan 1, 1996• 0 citations
Publisher
DOI
10.1007/978-1-4615-5897-2_48

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By degenerate four-wave mixing experiments in a two-beam geometry, we have investigated the initial coherence and dephasing of quasi two-dimensional excitions and biexcitons in GaAs multiple quantum wells. The dephasing has contributions from phonon scattering, interface-roughness scattering and exciton-exciton scattering. Inhomogeneous broadening and generation of coherent wavepackets play a significant role in the coherent exciton dynamics. The incoherent exciton dynamics, diffusion and recombination, is studied by three-beam transient grating experiments. A significant difference in the interface roughness scattering of coherent and incoherent (thermalized) excitons is observed.