In the solid state research, technological and experimental procedures for fabrication and analysis of micro- and nanostructures for cryoelectronics and sensorics, as well as preparation and study of new dielectric, semiconducting, superconducting and composite materials have been developed. Mesoscopic quantum and tunnel phenomena applicable in quantum computers and single particle detectors are studied both experimentally and theoretically. Strongly correlated electron systems and nonconventional superconductivity are being focused on in theoretical approaches. Another branch of research in condensed matter physics is represented by computer simulations. Here the main focus is on study of pressured-induced phase transformations in crystals using the original metadynamics-based approach. This research is relevant for crystal structure prediction and high-pressure physics and results are important in geophysics and materials science.