Titlebook: Electron-Electron Correlation Effects in Low-Dimensional Conductors and Superconductors; Alexandr. A. Ovchinnikov,Ivan I. Ukrainskii Confe

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Magnetic Properties of the Hubbard Model with Infinite Interactionsegments of length . (an .-chain model). It is shown that the total spin of the ground state grows from 0 to .. with an increase of electron density .. For two-chain model the critical value .. is found, above which the ground state is ferromagnetic. For .-chain model with . > 2 a “cascade” of the tr

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Christa Albrecht,Gertrud-Elisabeth BoniferNonlinear optical properties of (A – B).-polymers axe studied in the noninteracting electron approximation. Using a Keldysh Green function method there was calculated the nonlinear susceptibility of the third harmonic generation as well as nonlinear index of refraction. It was shown that the second order susceptibilities are equal to zero.

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