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Ultrafast Optical Spectroscopy of Large-Momentum Excitons in GaAs

Göger, G. ; Betz, M. ; Leitenstorfer, A. ; Bichler, Max ; Wegscheider, Werner ; Abstreiter, Gerhard
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Date of publication of this fulltext: 30 Nov 2009 13:27


Abstract

Highly energetic excitons with wave vectors much larger than that of an absorbed photon are excited in thin GaAs films. We observe propagation beats between three polariton modes up to 300 meV above the absorption edge employing femtosecond transmission spectroscopy. The dispersion relations of the coherent excitations are measured. Ultrafast exciton damping via scattering with nonequilibrium ...

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