χ⁽⁵⁾ signature in the four-wave-mixing signal from a GaAs/Al₀.₃Ga₀.₇As superlattice

Titelangaben

Bartels, G. ; Axt, Vollrath Martin ; Victor, K. ; Stahl, Arne ; Leisching, P. ; Köhler, K.:
χ⁽⁵⁾ signature in the four-wave-mixing signal from a GaAs/Al₀.₃Ga₀.₇As superlattice.
In: Physical Review B. Bd. 51 (1995) Heft 16 . - 11217(R).
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.51.11217

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Abstract

We analyze coherent beats with a period corresponding to the biexciton binding energy in time-integrated four-wave-mixing experiments in a GaAs/Al0.3Ga0.7As superlattice at high excitation densities. Theoretical and experimental evidence is presented that the beating in the decay is a fifth-order process in the electric field, and therefore χ(5) contributions to the four-wave-mixing signal in the 2k2-k1 direction have to be considered for a qualitative interpretation of the measured data. In order to model the experiment we use a microscopic dynamic density-matrix theory in a real-space representation.