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Information × Registration Number 0222U001519, 0117U002292 , R & D reports Title Theoretical study of collective phenomena in quantum condensed structures and nanomaterials popup.stage_title Head Kovalev Olexander S., Доктор фізико-математичних наук Registration Date 28-01-2022 Organization B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine popup.description2 New elements of qubit dynamics in a disordered environment are identified and the evolution of entanglement characteristics over time is analyzed, a quantitative characterization of the influence of this disorder on the entanglement of quantum systems is found for the first time. The influence of random potential on the transport properties of one-dimensional systems is analyzed, it is shown for the first time that its correlations lead to "transparency windows" without localization and the possibility of electronic transport. The theory for the propagation of the third sound in superfluid nanofilms taking into account the electro-activity of helium is constructed and a new effect of nonstationary thermoelectricity in such a process is envisaged. The thermodynamic properties of topological metals and semimetals are explained by the peculiarities of their Fermi surface, and the anomalous growth of magnetostriction is explained by the peculiarities of electronic topological transitions. The theory for magneto-oscillations of the conductivity of two-dimensional electron gas on the surface of liquid helium and their dependence on the spirality of microwave radiation has been developed. New magneto-oscillations in multiband semiconductors are predicted due to the nonequilibrium distribution of electrons in subzones which are fundamentally different from the Shubnikov-de Haas oscillations. The possibility of the phenomenon of absolute negative conductivity is proved. A new type of molecular transistors with a vibrating quantum dot is proposed and the possibility of controlling the current in them by an external magnetic field is demonstrated. The possibility of unusual complex stepped volt-ampere characteristics of the proposed spintronic molecular transistor is demonstrated. The theory of electromagnetic properties of artificial metamaterials from nanoresonators and local diamagnetism in them due to long-lived nonlinear excitations is constructed.   Product Description popup.authors popup.nrat_date 2022-03-09 Close