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Information × Registration Number 0223U001234, 0118U003010 , R & D reports Title Strong correlations and competition of interactions in classical and quantum lattice systems of varying dimension popup.stage_title Head Derzhko Oleh V., Доктор фізико-математичних наук Registration Date 26-01-2023 Organization Institute of Condensed Matter Physics of the National Academy of Sciences of Ukraine popup.description2 The theory of equilibrium and non-equilibrium properties of strongly correlated electronic systems (correlated transport effects, x-ray photoelectron emission, resonant inelastic scattering of x-rays and combined time-resolved light scattering) is developed. The theory of field effects of the SPS family and the theory of thermodynamic properties of the S = 1/2 Heisenberg model on the pyrochlore lattice are developed. The concept of localized magnons is applied to the calculation of entanglement of quantum states and the analysis of the magnetoelectric effect in “free-fermion” spin models. The theory of polarization of the ferroelectric squaric acid crystal is constructed. Product Description popup.authors Vdovych Andriy S. Velychko Oleh V. Duviryak Askold A. Shvaika Andrii M. Shchur Yaroslav Yo. Yaremko Yurij H. popup.nrat_date 2023-01-26 Close