Bilogolovskyy M. Electron quantum-coherent and incoherent transport in complex heterostructures

The aim of the thesis was to develop a consistent quantum-mechanical theory of transport phenomena in complex solid-state structures and to verify it experimentally. The object of the study was hybrid heterojunctions based on dielectric and metal (in the normal, superconducting, and ferromagnetic state) layers. The following results have been obtained: an analytical method for calculation of transport properties of multilayered planar structures has been developed, quantum-size effects in metallic layers on the phase-coherent transport were studied, influence of elastic and inelastic under-barrier collisions on charge-transport characteristics of heterostructures was determined and the nature of hysteretic phenomena in contacts based on complex oxides of transition metals was determined, a novel method for obtaining superconductors with improved surface characteristics was developed and practically realized, transition from quantum to semiclassical and classical transport regimes in multilayered structures was studied, and novel electronic devices based on hybrid multilayered structures, namely, Josephson junctions with single-valued characteristics, which are stable at 4.2 K, and a hybrid three-terminal superconducting analog of a semiconductor transistor were developed theoretically and realized experimentally. Results of the thesis can be used in scientific research in institutes of the NASU and universities as well as for development of new nano-electronic devices in research enterprises of Ukraine.