Spectral signature of biexciton beats in four-wave-mixing experiments

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Haase, B. ; Neukirch, U. ; Gutowski, Jürgen ; Bartels, G. ; Stahl, Arne ; Axt, Vollrath Martin ; Nürnberger, J. ; Faschinger, W.:
Spectral signature of biexciton beats in four-wave-mixing experiments.
In: Gershoni, David (ed.): 24th International Conference on the Physics of Semiconductors (ICPS), Jerusalem, Israel August 2 - 7, 1998 : Proceedings. - Singapore : World Scientific , 1998
ISBN 981-02-3613-1

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The spectral signature of biexciton beats in four-wave-mixing signals of ZnSe quantum wells is investigated both experimentally and theoretically. Its complex dependence on polarization, intensity, and relative delay of the exciting pulses is consistently explained within a microscopic density-matrix approach. Single χ(3) and two cascaded χ(3) processes (which are effectively of fifth order) are determined to be relevant for the signal generation at moderate excitation densities. The selection rules applying for the excitation of bound and unbound two-exciton states during these processes determine the spectral signatures of the beating.