Minakova K. Low-dimensional features of quasiparticle spectra and low-temperature thermodynamic characteristics of nanostructures based on graphene

Thesis of research is devoted to the study of low–dimensional features of quasiparticle spectra and low–temperature thermodynamic characteristics of nanostructures based on graphene and the solution of a scientific problem that consists in: constructing design models, which represent the fundamental characteristic features of quasiparticle spectra and due to their physical characteristics of the objects under study; the development of computational programs for the calculation of spectral densities and thermodynamic characteristics; analytical and numerical calculations of the electronic and phonon spectra of the studied carbon nanostructures and comparison of the results obtained with literature data; the study of the formation condition and the characteristics of quasiparticle states localized near imperfections–impurities and boundaries of various dimensions and chirality; identification of the stability conditions of the studied structures, ideal and with defects; calculation and analysis of the electronic and phonon spectral densities of local defective atoms and atoms near defects. As well as quantitatively explain the behavior of the temperature dependence of the heat capacity linear chains of atoms of inert gases adsorbed on the surfaces of carbon nanotubes, which are united in nanobandl. The main results of the research are that new fundamental knowledge is obtained on the phonon and electronic spectra of heterogeneous crystal structures, as well as on the effect of the appearance of defects in such structures. Explanations are given to a number of existing experimental data on the measurement of the low–temperature heats of solid solutions and the thermal expansion of quasi–two–dimensional crystals and multilayer crystals.