Nanocomposites and nanomaterials

Influence of Time Inversion and Spin-Orbit Interaction on Dispersion of Electronic States in Nanostructured and Crystalline Forms of Graphite and Transition Metal Dichalcogenides

V.O. Cubanov, A.P. Naumenko, I.S. Dotsenko, M.M. Biliy
Taras Shevchenko National University of Kyiv,
64/13, Volodymyrska Street, 01601 Kyiv, Ukraine
E-mail: a_naumenko@univ.kiev.ua

In order to develop the technologies for the creation of functional devices for microelectronics, much attention is being paid to the study of composite structures based on nanostructured and crystalline forms of layered structures of graphite and dichalcogenides of transition metals of molybdenum and tungsten, ie MoS2, MoSe2, MoTe2, WS2, WSe2 і WTe2. The symmetry of hexagonal crystalline forms of all the above-mentioned layered structures, including graphite, is described by the same space group of symmetry  and the energy spectra of their electron excitations, despite the energy and spin-orbit interaction differences, are characterized by qualitatively similar manifestations, primarily in the dispersion of their energy states.
The time-inversion effects on energy spectra excitations along Γ–Δ–Α, K–P–H, M–L–U lines discussed in detail.
We studied the character of the dispersion of electron excitations in nanostructured and crystalline forms of MX2 compounds (M = Mo, W; X = S, Se, Te) and we are the first who established the correlation with the dispersion of the electronic states of graphene and crystalline graphite.