Abstract
Exact summation of all Feynman diagrams for two-particle Green's function is performed for the one-dimensional Gaussian model of static fluctuations of short-range (antiferromagnetic) order with Lorentzian correlator analogous to “spin-bag” model of Schrieffer et al. We obtain the general picture of frequency dependence of conductivity for different ranges of correlation length of short-range order. For specific values of parameters we get good qualitative agreement with experimental data on optical absorption in high-Tc superconductors.
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