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Analytical properties of mean two-particle density matrix
Authors:Yu. D. Arbuzov  M. Yu. Kolenkin
Affiliation:(1) All-Union Scientific-Research Institute of Fuel Processing and Utilization, USSR
Abstract:The analytical properties of the mean two-particle density matrixZ(t)=intdR1 intdR2 <rgrc(R1:R2;t)rgrtau(R1,R2;t)> in the right-hand halfplane of the complex variable t is considered; herergrc,v(R1,R2; t) are single-particle density matrices. It is proven that, in the case of a Gaussian field, the function Z(t) is analytical in the region Ret > 0. It is shown that the frequency dependence of the light-absorption coefficient in disordered semiconductors is determined by the asymptote of the function Z(t) as trarrinfin.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 46–50, June, 1987.
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