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Information × Registration Number 0208U002051, 0105U002084 , R & D reports Title Development of the analytic methods of theory of energy spectrum and dynamics of strongly correlated systems of particles popup.stage_title Head Stasyuk Ihor Vasylyovych, Registration Date 15-01-2008 Organization Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine popup.description2 Spectral relations for multitime correlation functions including non-ergodic (conserving) contributions are obtained. The Jonson-Mahan theorem for the electron contributions to thermal transport is extended for the multilayered nanostructures. For the Falicov-Kimball model the resonant effects at the inelastic light scattering are investigated and nonresonant scattering spectra are obtained for the charge-ordered phase; dynamical susceptibilities are calculated for the model with correlated hopping. In the dynamical mean field theory an analytic approaches based on the equation of motion decoupling technique and generating functional method are developed. Conditions of the energy spectrum gap creation in the asymmetric Hubbard model are investigated. Existence of the ferromagnetic ordering in the pseudospin-electron model with tunneling splitting of levels is shown; the influence of such splitting on the metal-insulating transition is investigated. Electronic states of the YBa2Cu3O7-? and SrTiO3 heterostructures are described. The ground state diagrams for the generalized Blume-Emery-Griffiths model are built for the different types of the frustrated and unfrustrated lattices. Spectrum of the one-dimensional protonic (ionic) conductors are calculated within the fermionic lattice model and Pauli operators formalism. The spectrum and dynamical conductivity are investigated for the quasi-one-dimensional structures with hydrogen bonds where transitions to the charge modulated phases can realize. Effect of the transverse electric field, which narrows the ferroelectric phase existence temperature range, is investigated for the Rochelle salt crystal. The type of structure which corresponds to the dynamical disorder in the superionic phase of the M3H(XO4)2 crystals is confirmed numerically. The phase transitions connected with phase separation at ionic intercalation in the TiO2:Li type crystals and layered structures are described; the physics of the electret effect in the intercalated crystals of the indium andgallium selenide is investigated. For the quantum boson systems the approach for the description of the kinetics including slow hydrodynamic transfer processes is developed. The formalism and applications of the partially reduced field theory is developed. Nonlocal Lagrangians with the excluded interaction agents variables are constructed, their hamiltonianization and canonical quantization is performed. Several relativistic potential models of mesons are constructed, spectra of light mesons which agree with experiment are calculated. New scheme of renormalizations in the classical field theory is developed. Product Description popup.authors popup.nrat_date 2020-04-02 Close