Search academic texts

Information × Registration Number 0220U101659, 0119U100176 , R & D reports Title Spin-dependent processes in crystals and nanostructures, development the projective representation methods of symmetry groups for their interpretation. popup.stage_title Head Gubanov Viktor О., Доктор фізико-математичних наук Registration Date 17-02-2020 Organization Taras Shevchenko National University of Kyiv popup.description2 Object of the study - Crystals of hexagonal syngony, linear π-electron coupled systems, one- and two-dimensional carbon graphite structures and their inorganic analogues, nanocomposites based on them. The purpose of the work is to study the energy spectra of elementary excitations in crystals, nanostructures and nanocomposites and their interpretation with involvement advanced methods for constructing projective representations of symmetry groups and methods of quantum chemistry. Research methods - symmetry group theory methods, Raman spectroscopy, spectrophotometry, photoluminescence, quantum chemistry methods. The correlation of oscillation modes, their dispersion and dispersion dependences of electron excitations without taking into account the spin of the electron and with its consideration in single-layer graphene and graphite crystals and crystals of hexagonal boron nitride are investigated. For the projective representations of all projective classes of a hexagonal system, standard factor-systems were first constructed, including the first to determine the factor-systems for electronic states, by which the correct tables for the multiplication of spinors were first found. of graphene and crystalline graphite the existence of spin-dependent splits of energy electronic spectra, in particular, splitting of π-zones at Dirac points, whose magnitude can be significant, for example, for transition metal dichalcogenides of the same spatial symmetry group, but small for single-layer graphene and crystalline graphite, since it is caused by low spin-orbital interaction energy (~ 1.0 ÷ 1.5 meV) for carbon atoms, and, as a consequence, it is small for all carbon structures.  Product Description popup.authors Bilyy Mykola M. Bashmakova Nataliia V. Hrynʹ Dmytro V. Gubanov Viktor O. Kornienko Mykola E. Navozenko Oleksandr M. Naumenko Antonina P. Sabov Maksym M. Yahnenko Marianna S. popup.nrat_date 2020-04-02 Close