Research area:

Lattice Dynamics, phonons and other quasi-particle excitations in solids.

• Propagation and localization of vibrations in heterogeneous structures and disordered systems, strongly anisotropic crystal structures, and quasi-low-dimensional lattices.
• Vibrational characteristics of crystals with complex defects;
• Quasi-particle spectra of nanosystems

Main achievements:

• The quantum-interference effect is predicted in metal plates of thickness L ≤ l₀ (l₀ is the mean free path) upon multichannel specular reflection of electrons at the metal surface in a weak magnetic field H perpendicular to the plate boundary. The effect consists in an increase in the Hall coefficient R (for small values of H) as compared to its normal value by a factor of p_F L / ћ (p_F is the characteristic Fermi momentum). The expression obtained for R are found to be valid for an arbitrary number of multichannel specular reflection channels. (in collaboration with A.A. Slutskin).
• Basic vibrational characteristics of fcc solid inert gases (including the quantum Ne crystal) and some fcc metals (Ag, Cu, Pb, Pd) were described to a fairly high degree of accuracy in the framework of a model taking into account only the interaction of the nearest neighbors. In this case the force constants can be calculated unambiguously from the known components of the elastic constant tensor and lattice constant.
• The features of phonon spectra and their effect on the vibrational heat capacity of linear chains of inert gas atoms adsorbed onto a substrate, which is the surface of nanotubes bound to a nanobandle are studied. The conditions of the existence and the main characteristics (frequencies, intensities, and attenuation parameters) of discrete vibrational levels caused by structural defects of linear chains of inert gas atoms adsorbed on the surface of nanotubes aggregated in nanobundles, are calculated and analyzed.

Selected Conferences:

1. 10-th International Conference on Cryocrystalas and Quantum Crystals, Almaty, Kazakhstan, August31-September7, 2014.
2. 11-th International Conference on Cryocrystalas and Quantum Crystals, Turku, Finland, 18-24 August, 2016.
3. 12-th International Conference on Cryocrystalas and Quantum Crystals, Wrocław/Wojanów, Poland 26-31 August, 2018.

Chapters in monographs:

1. A. Feher, E. Syrkin, I. Gospodarev, E. Manzhelii, A. Kotlyar, K. Kravchenko, The Features of Low Frequency Atomic Vibrations and Propagation of Acoustic Waves in Heterogeneous Systems, in: “Waves in Fluids and Solids” (ed. R.P. Vila) “InTex” Open Access Publisher, ISBN 978-953-307-246-3 Croatia, 2011.
2. I.A. Gospodarev, O.V. Kotlyar, K.V Kravchenko, E.V. Manzhelii, E.S Syrkin, A.V.Yeremenko, I.K. Galetich, Low Temperature Peculiarities of Quasi-Particle Spectra of Disordered Solid Solutions, in: “Contemporary Problems of Mathematics, Mechanics and Computer Sciences” (eds. N.N. Kizilova, G.N. Zholtkevich) PRB Virovec’, ISBN 978-966-2579-92-5 Ukraine, p.45 (2011).
3. A. Feher, E. Syrkin, S. Feodosyev, I. Gospodarev, E. Manzhelii, A. Kotlyar, and K. Kravchenko, Electronic and Vibrational Properties of Adsorbed and Embedded Graphene and Bigraphene with Defects, in “New Progress on Graphene Research” (ed. J.R. Gong) InTex, ISBN 978-953-51-1091-0 Croatia, p.135 (2013).

Selected articles:

1. A.A. Slutskin, L.Yu. Gorelik and E.V. Manzhelii, Qantum Nonlinear Galvanomagnetic Effects in Metal Plates upon Multichannel Specular Reflection of Electrons, Sov . J. Low. Temp. Phys. 14, 579 (1988).
2. A.A. Slutskin, E. V. Manzhelii, Quantum Galvanomagnetic Effects in Metal Plates in a Weak Transverse Magnetic Field due to Multichannel Specular Reflection of Electrons, Low Temp. Phys. 19, 589 (1993).
3. Yuri A. Freiman, A. Jezovski, Z. Litwicki, A. P. Brodianskii and E. V. Manzhelii, Magnetic Susceptibility of Molecular Cryocrystals Doped with Oxygen Impurity, Czechoslovak Journal of Physics, 46 , Suppl. S4. (1996).
4. E. V. Manzhelii, Dispersion Relations for Cubic Crystals with Noncentral Interactions. Cryocrystals, Low Temp. Phys.29, 333 (2003).
5. S.B.Feodosyev, I.A.Gospodarev, V.O.Kruglov., E.V.Manzhelii, Reconstruction of FCC Crystal Lattice Dynamics from Elastic Moduli, Journ. of Low Temperature Physics, 139, № 5/6,651-659 (2005).
6. M.I. Bagatskii,V.V. Dudkin, D.A. Mashcenko, V.G. Manzhelii, and E.V.Manzhelii, Isotopic effects inthe heat capacity of concentrated orientationally disordered solid solutions of methane and deuteromethane in krypton, Low Temp. Phys, 31, 990 (2005).
7. I.A. Gospodarev, V.I. Grishaev, O.V. Kotlyar, K.V. Kravchenko, E.V. Manzhelii, E.S. Syrkin, and S.B. Feodosyev, Ioffe–Regel crossover and boson peaks in disordered solid solutions and similar peculiarities in heterogeneous crystal structures Low Temperature Physics, 34, No 8, 655, 2008.
8. A. Feher, I.A. Gospodarev, V.I. Grishaev, K.V. Kravchenko, E.V. Manzheliĭ, E.S. Syrkin and S.B. Feodos’ev, Effect of defects on the quasiparticle spectra of graphite and graphene, Low Temp. Phys. 35, No 8, 679 2009
9. A.Feher, I.Gospodarev, O.Kotlyar, K.Kravchenko, E.Manzhelii, E.Syrkin, S.Feodosyev Impurity levels in the electron spectra of graphene, Superlattices and Microstructures, 53, 55, 2013
10. I.A. Gospodarev, V.I. Grishayev, A.V. Eremenko, M.S. Klochko, A.V. Kotlyar, E.V. Manzheliy, E.S. Syrkin and S.B. Feodosyev, Low-frequency properties of the phonon spectra, and low-temperature thermodynamics of disordered solid solutions, Low Temp. Phys. 40, 1013, 2014
11. E.V. Manzhelii, S.B. Feodosyev, I.A. Gospodarev, E.S. Syrkin and K.A. Minakova, Phonon spectrum and vibrational characteristics of linear nanostructures in solid matrices, Low Temp. Phys. 41, 557, 2015.
12. E.V. Manzhelii, S.B. Feodosyev, I.A. Gospodarev, E.S. Syrkin and K.A. Minakova, Phonon spectrum and vibrational characteristics of linear nanostructures in solid matrices, Low Temp. Phys. 41, 557, 2015;
13. I. A. Gospodarev, V. I. Grishaev, E. V. Manzhelii, E. S. Syrkin, S. B. Feodosyev, and K. A. Minakova, Phonon heat capacity of graphene nanofilms and nanotubes, Low Temp. Phys.,43, 264 (2017);
14. E.V. Manzhelii, Influence of defects on vibrational characteristics of linear chains of inert gases atoms adsorbed on carbon nanobundles, J Low Temp Phys, 187, 105 (2017);
15. E.V. Manzhelii, S. B. Feodosyev, and I.A. Gospodarev, Phonon spectra and vibrational heat capacity of quasi-one-dimensional structures formed by rare gas atoms on the surface of carbon nanotube bundles, Low Temp. Phys., 45, 355 (2019).