Theory of Exciton Formation and Relaxation in Quantum Wires

Titelangaben

Siantidis, K. ; Axt, Vollrath Martin ; Wühr, J. ; Kuhn, Tilmann:
Theory of Exciton Formation and Relaxation in Quantum Wires.
In: Physica Status Solidi A. Bd. 190 (2002) Heft 3 . - S. 743-747.
ISSN 1521-396X
DOI: https://doi.org/10.1002/1521-396X(200204)190:3<743::AID-PSSA743>3.0.CO;2-F

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Abstract

The relaxation dynamics of electron–hole pairs generated by a short laser pulse near the band edge of a GaAs quantum wire is analyzed by using a microscopic density matrix approach. We account for Coulomb renormalizations of various scattering mechanisms that are of importance near the band gap. The exciton formation dynamics, photoluminescence signals, and the build-up of center-of-mass kinetic energies depend crucially on the excitation energy. Exciton formation and dissociation are shown to change characteristically with temperature.