SIBERIAN JOURNAL OF PHYSICS. Scientific Journal. 2019. V14, i 1

The Theoretical and Mathematical Physics

Zobov V. E., Pichkovskiy I. S. Sequences of Selective Rotation Operators to Engineer Interactions for Quantum Annealing on Three Qutrits

We have done simulating of factorization the number 15 on three qutrits S = 1 by quantum annealing. We assume that strong one-spin interaction allow selectively operate on different transitions between levels of the each qutrit. We present a sequence of selective rotation operators to engineer from dipole-dipole interaction a time-dependent effective Hamiltonian necessary for solving the problem. Also we find dependence of fidelity versus various parameters: magnetic field, total annealing time, and duration of time step, when the continuous variation of the Hamiltonian is replaced by a discrete one.

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Physics of a Fluid, Neutral and Ionized Gases

Vozhakov I. S. Integral Model of Wavy Flow Regimes of Thin Viscous Liquid Layer Taking into Account Second Order Terms and Influence of the Gas Flow

In this paper, a model is obtained which takes into account the influence of second-order terms of smallness in the long-wavelength parameter, as well as tangential and normal stresses from the gas flow. The linear stability of the obtained system of equations was studied and the results were compared with the exact solution of the Orr-Sommerfeld equation. It is shown that integral models differ from the exact solution even at low Reynolds numbers, which is due to the fact that the longitudinal velocity profile differs from the semi-parabolic one. The evolution of nonlinear waves was simulated for both a free falling and a liquid film entrained in a gas stream. The profiles of stationary-traveling waves for different Reynolds numbers are obtained. A comparison of the profiles of waves obtained by different models has been carried out. It is shown that the differences in the results obtained by different models are insignificant, and the interaction with the gas flow leads to a decrease in the wavelength of the disturbances

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Gaponov S. A., Smorodsky B. V. Influence of Surface Sublimation on Supersonic Boundary Layer Properties

The paper presents results of theoretical investigation of characteristics of the supersonic Mach = 2 flat-plate boundarylayer under conditions of surface sublimation in the flow of air. Naphthalene (C10H8) is used as a sublimation material. Calculations found that with increasing surface temperature, the mass flow rate of naphthalene evaporation also increases. In this case, the total heat flux to the solid wall decreases, while its temperature decreases also in comparison with the case of a flow past a flat-plate without sublimation. Large molecular weight of naphthalene in comparison with molecular weight of air and lowering of the surface temperature as a result of the wall material evaporation lead to an increase in the density of the binary mixture (air and vapor of the sublimation substance) near the wall, that can lead to an increase in the stability of the supersonic boundary layer and to a delay in its transition to turbulence.

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Dremov S. V., Skrypkin S. G., Shtork S. I. Changing of Disturbance Helical Modes in Swirling Flow during Dispersed Gas Phase Injection

The research is devoted to studying of large-scale precessing double vortex arising in two-phase flow in flowing hydrodynamic tangential vortex reactor. The effect of stabilizing and merging of double helix into a single quasistationary columnar vortex by injecting the gas phase into the flow was discovered. The flow structure changing was recorded by means of a high-speed visualization technique. Quantitative measurements characterizing the flow structure were obtained by using laser Doppler anemometry technique.

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Goldfeld M. A., Starov A. V. Flow Realization in Hypersonic Air Inlet with Spatial Compression

The results of a numerical and experimental study of a hypersonic air inlet with spatial compression and a compact cross section of the internal channel are presented. Reducing the surface area of the channel simplifies the heat protection of the air inlet and the combustion chamber. Experimental studies were carried out in a blow-down wind tunnel for Mach numbers M = 2–6. The pressure distributions on the compression surfaces and in the air inlet channel are obtained, the coefficients of the total pressure recovery and flow rate, the Mach number in the throat of the air inlet are determined. The influence of the side cheeks and of the boundary layer bleed has been found. It is determined that in a convergent air inlet significantly higher compression ratios are realized than in a two-dimensional air inlet with less drag. It was established that on the basis of solving the three-dimensional Euler equations and the boundary layer, it is possible to reliably predict the characteristics of the air inlet in off-design modes and determine the structure of the flow.

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Solid-State and Semiconductor Physics, Physics of Nanostructures

Anikin К. V., Milekhin А. G., Rodyakina Е. Е., Veber S. L., Latyshev А. V., Zahn D. R. T. Optical Plasmon Resonances in Arrays of Au Nanoclusters

This work is devoted to the study of the phenomenon of localized surface plasmon resonance (LSPR) in Au nanocluster arrays using optical reflection spectroscopy. Arrays of nanoclusters having the shape of a cylinder, the diameter and period of which vary in the range of 30–150 and 130–200 nm, respectively, were manufactured on Si and Si / SiO2 substrates by electron beam lithography. From a comparison of experimental reflection spectra with numerically calculated by finite difference time domain method (FDTD), the structural parameters of the model of plasmon nanostructures, used later for the calculation of absorption spectra of plasmon structures, were determined. The LSPR frequencies were determined by the maximum of the absorption spectra. This study revealed a strong dependence of the LSPR frequency position on the size of nanoclusters, the distance between nanoclusters, and the thickness of the SiO2 layer in the nanometer range. Particular attention was paid to the observation of the reflection spectra of the formation of a transverse plasmon mode propagating along the surface of the substrate and polarized perpendicular to the surface. We associate the excitation of this mode with the scattering of the electromagnetic field on neighboring nanoclusters. The proposed method provides the possibility of rapid determination of the frequency position of the LSPR in the optical reflection spectra, which is especially important in the case of opaque substrates (including Si and Si / SiO2 substrates), for which the measurement of optical absorption is impossible. A wide range of potential applications for metallic nanostructures with well-controlled plasmon properties includes surface-enhanced infrared absorption, photoluminescence, and Raman scattering, as well as signal transmission in silicon Photonics.

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Rodyakina E. E., Sitnikov S. V., Latyshev A. V. Critical Terrace Width for Vacancy Islands Nucleation on Wide Terrace of Silicon (001) Surface under High Temperature Annealing

The process of forming a system of concentric steps on the silicon (001) surface, separated by wide terraces, has been studied in situ by means of ultrahigh vacuum reflection electron microscopy. The possibility of controlling terraces width by compensating atoms sublimation by an external atoms flux has been shown. The temperature dependences of the critical diameter of the terraces for the nucleation of a new vacancy island have been measured in along and across dimer row of superstructure 1 ? 2 direction in the temperature range 1070 – 1160 °C. The increase in the critical diameter with increasing atomic flux has been demonstrated. The anisotropy of a critical terrace size decreases with an increase in temperature independently of deposition flux and the critical size of the terrace along and across the dimer row coincides with an error accuracy at temperatures above 1125 °C. The kinetics of vacancy islands nucleation has been determined in the framework atomic nucleation theory, and the values of the critical nucleus, the binding energy in the nucleus and the difference of diffusion energies along and across dimer rows have been estimated.

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Educational and Methodical Provision of Teaching of Physics

Boldyreva E. V. Education for New Synchrotron Sources. The Experience of the First Interdisciplinary Master Program of the Novosibirsk State University

The author of these notes discusses the educational problems related to the planned construction and subsequent usage of new synchrotrons in Russia and shares the first experience of launching an interdisciplinary Master program in Physics and Chemistry at the Novosibirsk State University.

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Instructions to Contributors

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