Signatures of high-order Coulomb correlations in coherently controlled four- and six-wave-mixing experiments on a ZnSe quantum well

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Voss, Tobias ; Breunig, Hans Georg ; Rückmann, Ilja ; Gutowski, Jürgen ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Signatures of high-order Coulomb correlations in coherently controlled four- and six-wave-mixing experiments on a ZnSe quantum well.
In: Long, A. R. ; Davies, J. H. (ed.): Physics of semiconductors 2002 : proceedings of the 26th International Conference on the Physics of Semiconductors held in Edinburgh, UK, 29 July - 2 August 2002. - Bristol : Institute of Physics , 2003 . - CD-ROM, H92 . - (Institute of Physics Conference Series ; 171 )
ISBN 978-0-7503-0924-0

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In this paper we present experimental and theoretical investigations of coherently controlled four- and six-wave-mixing experiments on a ZnSe single quantum well. In the signal which is mainly modulated with the exciton transition frequency we observe strong contributions of integer harmonics of this frequency if the experiment is carried out with colinearly polarized excitation pulses. If the the polarization states are switched to a co-circular polarization state these harmonics are strongly suppressed but do not vanish completely. This polarization dependence of the harmonics suggests that biexcitons as well as two-exciton scattering states play an important role in the microscopic origin of this non-linear behavior. A theoretical approach based on the dynamics-controlled truncation scheme (DCT) is able to reproduce the experimental findings on a level on which six-point correlations are included. By selectively switching on and off parts of the full theory we clearly demonstrate that twopair correlations, in particular biexcitons, crucially determine the occurrence and intensity of the observed additional frequencies.