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Information × Registration Number 0221U107114, 0120U104857 , R & D reports Title Multiband electronic states: physics and applications popup.stage_title Head Kordiuk Oleksandr A., Доктор фізико-математичних наук Registration Date 27-12-2021 Organization State Research Institution "Kyiv Acedimic University" popup.description2  As part of the development of the Center for Quantum Research, a protocol for conducting remote experiments has been developed. This protocol was tested with the participation of students of KAU and other universities to promote the study of quantum materials. MoRe contact technology for superconducting interferometer has been developed. We have defined the peculiarities of the electronic structure of new super-thin superconducting films made of FeSe and other multiband materials, such as BSCCO and TiTe2, in which the enhancement of superconducting properties due to proximity of the Fermi surface to the Lifshitz topological transition is expected. The compliance of this structure with the envisaged one is analyzed. Experimentally, the tunneling spectrum of the multiband Mo-Re superconductor was measured with high resolution, which made it possible to confirm the presence of two superconducting order parameters and define the phonon spectrum corresponding to its formation. Thus, the multi-band model has been tested on new experimental data. The key parameters of high-frequency electrodynamics of multiband superconductors have been determined. Namely, the dissociation of composite vortices in the high-frequency electromagnetic field of the microwave range was theoretically identified and studied. A model of nonlinear microwave response of a multiband superconductor based on the internal Josephson interband effect has been developed. The influence of fluctuations and dissipative processes on the dynamics of fractional vortices is analyzed. Product Description popup.authors Bezghuba Volodymyr V Bohachov Kyrylo H. Boliasova Olha O. Kasatkin Oleksandr L. Kordyuk Oleksandr A. Kutsyk Andrii M. Pokusinsʹkyy Anton O. Pustovit Yurii V. Shapovalov Andrii P. popup.nrat_date 2022-03-09 Close