http://dspace.nbuv.gov.ua:80/handle/123456789/115078 2026-04-23T23:30:23Z 2026-04-23T23:30:23Z Фуголь, И. http://dspace.nbuv.gov.ua:80/handle/123456789/119220 2017-06-06T07:52:41Z 2011-01-01T00:00:00Z

Эмануил Канер с нами в памяти сердца Фуголь, И.

2011-01-01T00:00:00Z Gumen, L.N. Arriaga, J. Krokhin, A.A. http://dspace.nbuv.gov.ua:80/handle/123456789/118797 2017-06-01T00:03:42Z 2011-01-01T00:00:00Z

Metafluid with anisotropic dynamic mass Gumen, L.N.; Arriaga, J.; Krokhin, A.A. We show that a fluid filling the space between metallic cylinders arranged in a two-dimensional lattice exhibits anisotropic dynamic mass for sound waves propagating through the lattice, if its unit cell is anisotropic. Using the plane-waves expansion method we derive (in the long wavelength limit) a formula for the effective mass tensor of the metafluid. The proposed formula is very general — it is valid for arbitrary Bravais lattices and arbitrary filling fractions of the cylinders. We apply our method to a periodic structure with very high anisotropy, when other known methods fail. In particular, we calculate the effective mass tensor for sound waves in air with embedded lattice of aluminum cylinders having rectangular cross sections, and obtain excellent agreement with experiment. The proposed method of calculation may find numerous applications for tailoring of metafluids with prescribed anisotropy.

2011-01-01T00:00:00Z Gvozdikov, V.M. http://dspace.nbuv.gov.ua:80/handle/123456789/118796 2017-06-01T00:03:24Z 2011-01-01T00:00:00Z

The Landau band effects in the quantum magnetic oscillations and the deviations from the quasiclassical Lifshitz–Kosevich theory in quasi-two-dimensional conductors Gvozdikov, V.M. The quantum magnetic oscillations (QMO) in the layered and quasi-two-dimensional (2D) conductors deviate from the quasiclassical Lifshitz–Kosevich (LK) theory developed for 3D conventional metals. We discuss deviations related to the broadening of the Landau levels into Landau bands by various mechanisms (layer-stacking, magnetic breakdown, incoherence, disorder, localization etc.). Each mechanism yields a specific factor modulating the QMO amplitudes depending on the density of states and electron velocities within the Landau bands. In contrast to the LK theory, these factors differ for the thermodynamic (de Haas–van Alphen (dHvA)) and kinetic (Shubnikov–de Haas (SdH)) oscillations. We calculated the magnetic breakdown damping factors for the SdH and dHvA oscillations in the 2D conductors and analyzed their difference as well as the analogy between the bandwidth and Weiss oscillations. In case of an isotropic 3D metals the kinetic factors become proportional to the thermodynamic ones as is assumed in the LK theory.

2011-01-01T00:00:00Z Torres-Herrera, E.J. Izrailev, F.M. Makarov, N.M. http://dspace.nbuv.gov.ua:80/handle/123456789/118795 2017-06-01T00:03:59Z 2011-01-01T00:00:00Z

Anderson localization in metamaterials with compositional disorder Torres-Herrera, E.J.; Izrailev, F.M.; Makarov, N.M. We consider one-dimensional periodic-on-average bi-layered models with random perturbations in dielectric constants of both basic slabs composing the structure unit-cell. We show that when the thicknesses da and db of basic layers are essentially nonequal, da ≠ db, the localization length Lloc is described by the universal expression for two cases: (a) both layers are made from right-handed materials (the RH–RH model), (b) the a layers are of a right-handed material while the b layers are of a left-handed material (the RH–LH model). For these models the derived expression for Lloc includes all possible correlations between two disorders. However, when da = db the RH–LH model exhibits a highly nontrivial properties originated from inhomogeneous distribution of the phase of propagating wave, even in the case of white-noise disorder. We analytically show that in this case the localization length diverges in the conventional second order in perturbation parameters. Therefore, recently numerically discovered anomalies in Lloc are due to the next order of approximation. On the other hand, for the RH–RH model the general expression for Lloc remains valid for da = db as well.

2011-01-01T00:00:00Z