RAS Institute of Radio Engineering and Electronics

Moscow, Russia

Institute of Radio-engineering and Electronics ) by the Russian Academy of Science is an institute in Moscow, that conducts fundamental research in fields of radiophysics, radiotechnics, physical and quantum electronics, informatics. It was established in 1953 as an institute of the USSR Academy of science, and expanded in 1955 to include sites in Fryazino, Saratov and Ulyanovsk. Since 1954, for a long time its director was the famous Soviet scientist Vladimir Kotelnikov. As of 2006 the director is Yuri Gulyaev.In 1957 by a decision of the Central Committee of the CPSU and the Council of Ministers the institute was assigned a task of establishing stations, that would receive signals of Sputnik 1. There were very few professional stations in the USSR at the time, and the institute cooperated with radio amateurs throughout the country and provided necessary equipment to 30 selected large DOSAAF amateur radio clubs from the Baltic Sea to the Pacific Ocean.The institute lead scientific works on the creation of the planetary radar and on the radiolocational exploration of other planets. One of the main results was creation of the first ever radar map of the Northern Hemisphere of Venus in 1984, using results of Venera 15 and Venera 16 missions.In 1969 the institute was awarded the Order of the Red Banner of Labour. Wikipedia.

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Sablikov V.A.,RAS Institute of Radio Engineering and Electronics
Physical Review B - Condensed Matter and Materials Physics | Year: 2017

We study the two-body problem for two-dimensional electron systems in a symmetrized Bernevig-Hughes-Zhang model, which is widely used to describe topological and conventional insulators. The main result is that two interacting electrons can form bound states with the energy in the gap of the band spectrum. The pairing mechanism can be interpreted as the formation of a negative reduced effective mass of two electrons. The problem is complicated because the relative motion of the electrons is coupled to the center-of-mass motion. We consider the case of zero total momentum. Detail calculations are carried out for the repulsive interaction potential of steplike form. The states are classified according to their spin structure and two-particle basis functions that form a given bound state. We analyze the spectra and electronic structure of the bound states in the case of both topological and trivial phases and especially focus on effects originating from the band inversion and the coupling of the electron and hole bands. In the trivial phase and the topological phase with the large coupling parameter a, the bound state spectra are qualitatively similar. However, when a is less a certain value, the situation changes dramatically. In the topological phase, new states arise with a higher binding energy at lower interaction potential, which evidences that the band inversion can favor pairing the electrons. © 2017 American Physical Society.

Sablikov V.A.,RAS Institute of Radio Engineering and Electronics
Physical Review B - Condensed Matter and Materials Physics | Year: 2010

We develop a realistic and analytically tractable model to describe the spin current which arises in a quantum point contact (QPC) with spin-orbit interaction (SOI) upon a small voltage is applied. In the model, the QPC is considered as a saddle point of two-dimensional potential landscape. The SOI acts within a finite region and is absent deep in the reservoirs. The SOI strength is not supposed to be strong. It is shown that the spin polarization appears in the third order of the perturbation theory as a result of definite combinations of electron transitions. They include two intersubband transitions to nearest subbands and one intrasubband transition. The spin current is proportional to the cube of the SOI strength and strongly depends on geometric parameters of the saddle point. The spin is polarized in the plane of the QPC and directed normally to the electron current if the SOI is of Rashba type. As a function of the saddle-point potential (i.e., the height of the QPC barrier), the spin conductance and especially the spin polarization have characteristic features (specifically, peaks) correlated with the charge conductance quantization steps. The peak shape depends on the length of the region where the SOI acts. In QPCs with sharp potential landscape, this picture is distorted by interference processes. © 2010 The American Physical Society.

Leinson L.B.,RAS Institute of Radio Engineering and Electronics
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2010

The linear response of a neutron spin-triplet superfluid onto external weak axial-vector field is studied for the case of 3P2 pairing with a projection of the total angular momentum mj = 0. The problem is considered in BCS approximation discarding Fermi-liquid effects. The anomalous axial-vector vertices of neutron quasiparticles possess singularities at some frequencies which specify existence of undamped spin-density waves in the Cooper condensate. The spin waves are of a low excitation energy and are kinematically able to decay into neutrino pairs through neutral weak currents. The calculation predicts significant energy losses from within a neutron star at lowest temperatures when all other mechanisms of neutrino emission are killed by the neutron and proton superfluidity. © 2010 Elsevier B.V. All rights reserved.

Leinson L.B.,RAS Institute of Radio Engineering and Electronics
Physical Review C - Nuclear Physics | Year: 2010

Neutrino emission resulting from the pair breaking and formation processes in the bulk triplet superfluid in neutron stars is investigated taking into account anomalous weak interactions. I consider the problem in the BCS approximation discarding Fermi-liquid effects. By this approach I derive self-consistent equations for anomalous vector and axial-vector vertices of weak interactions taking into account 3P2-3F2 mixing. Further, I simplify the problem and consider pure 3P2 pairing with mj=0, as is adopted in the minimal-cooling paradigm. As was expected because of current conservation, I have obtained a large suppression of neutrino emissivity in the vector channel. More exactly, the neutrino emission through the vector channel vanishes in the nonrelativistic limit VF=0. The axial channel is also found to be moderately suppressed. Total neutrino emissivity is suppressed by a factor of 1.9×10-1 relative to original estimates using bare weak vertices. © 2010 The American Physical Society.

Anisimkin Sr. V.I.,RAS Institute of Radio Engineering and Electronics
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control | Year: 2010

Acoustic plate modes of different orders n, having equal velocities vn close to that of the longitudinal BAW vL, are numerically studied in crystals of different symmetries. Three families of the modes with vn ∼ vL, each at relevant plate thickness h/λ= (h/λ)n, are found (h is the thickness, λ is the wavelength): the generalized Lamb mode with comparable longitudinal u1, shear-horizontal u2, and shear-vertical u3 displacements, the Anisimkin Jr. (AN) mode with u1 > u2 and u3, and u1 ≈ constant ≠ 0 at any depth, and the quasilongitudinal (QL) mode with u1 > u2, and u3, but u 1 constant over the plate thickness. Existence of the families does not depend on anisotropy or piezoelectric properties of the plate, but on the closeness of the mode velocity vn to the BAW velocity vL, the value of the dispersion slope dvn/d(h/λ) at vn = vL and h/λ = (h/λ)n, and the proximity of the plate thickness (h/λ)n supporting the mode, to the thickness (h/λ)R providing transverse BAW resonance between plate faces. The Lamb modes approach vn = vL at irregular (h/λ)n far from resonance (h/λ)R and at large dvn/d(h/λ) ∼103 m/s. The two other modes are characterized by lower dispersion dvn/d(h/λ) ≤ 103 m/s and regular (h/λ)n close to the resonance (h/λ)R. Because both modes have small vertical displacement on plate faces and propagate almost entirely within the crystals, they are attractive for liquid sensing. © 2010 IEEE.

Leinson L.B.,RAS Institute of Radio Engineering and Electronics
Physical Review C - Nuclear Physics | Year: 2012

The complete spectrum of collective modes of the triplet order parameter in the superfluid neutron matter is examined in the BCS approximation below the pair-breaking threshold. The dispersion equations both for the unitary and nonunitary excitations are derived and solved in the limit of q→0 by taking into account the anisotropy of the energy gap for the case of P-wave pairing. By our analysis, there is only one Goldstone mode which is associated with the broken gauge symmetry. We found no additional Goldstone modes associated with the broken rotational symmetry but found that the oscillations of the total angular momentum are qualitatively similar to the "normal-flapping" mode in the A phase of superfluid helium. There are also two collective modes associated with internal vibrations of the structure of the order parameter oscillating with ω(T=0)=1.20Δ 0 and ω(T=0)=0. 61Δ 0. © 2012 American Physical Society.

Ptuskin V.,RAS Institute of Radio Engineering and Electronics
Astroparticle Physics | Year: 2012

The theoretical aspects of cosmic ray transport in the Galaxy are discussed. The emphasis is on the diffusion model of cosmic ray propagation. The results of the empirical modelling are combined with the approach based on the kinetic theory of particle interaction with random magnetic fields. The plasma effects of cosmic rays in the interstellar medium are briefly discussed. © 2012 Elsevier B.V. All rights reserved.

Leinson L.B.,RAS Institute of Radio Engineering and Electronics
Physical Review C - Nuclear Physics | Year: 2011

The influence of the admixture of the 3F2 state onto collective spin oscillations and neutrino emission processes in the triplet superfluid neutron liquid is studied in the BCS approximation. The eigenmode of spin oscillations with ω√58/35Δ is predicted to exist in the triplet superfluid neutron condensate besides the already known mode ωΔ/√5. Excitation of the high-frequency spin oscillations in the condensate occurs through the tensor interactions between quasiparticles. Neutrino energy losses through neutral weak currents are found to consist of three separate contributions caused by a recombination of broken Cooper pairs and by weak decays of the collective modes of spin oscillations. Neutrino decays of the low-frequency spin waves can play an important role in the cooling scenario of neutron stars. Weak decays of the high-frequency oscillations that occur only if the tensor forces are taken into account in the pairing interactions does not modify substantially the total energy losses. Simple expressions are suggested for the total neutrino emissivity. © 2011 American Physical Society.

Smirnov D.A.,RAS Institute of Radio Engineering and Electronics
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2013

Transfer entropy (TE) seems currently to be the most widely used tool to characterize causal influences in ensembles of complex systems from observed time series. In particular, in an elemental case of two systems, nonzero TEs in both directions are usually interpreted as a sign of a bidirectional coupling. However, one often overlooks that both positive TEs may well be encountered for unidirectionally coupled systems so that a false detection of a causal influence on the basis of a nonzero TE is rather possible. This work highlights typical factors leading to such "spurious couplings": (i) unobserved state variables of the driving system, (ii) low temporal resolution, and (iii) observation errors. All are shown to be particular cases of a general problem: imperfect observations of states of the driving system. Importantly, exact values of TEs, rather than their statistical estimates, are computed here for selected benchmark systems. Conditions for a "spurious" TE to be large and even strongly exceed a "correct" TE are presented and discussed. © 2013 American Physical Society.

Kuznetsov S.P.,RAS Institute of Radio Engineering and Electronics
Physics-Uspekhi | Year: 2011

Research is reviewed on the identification and construction of physical systems with chaotic dynamics due to uniformly hyperbolic attractors (such as the Plykin attraction or the Smale-Williams solenoid). Basic concepts of the mathematics involved and approaches proposed in the literature for constructing systems with hyperbolic attractors are discussed. Topics covered include periodic pulse-driven models; dynamics models consisting of periodically repeated stages, each described by its own differential equations; the construction of systems of alternately excited coupled oscillators; the use of parametrically excited oscillations; and the introduction of delayed feedback. Some maps, differential equations, and simple mechanical and electronic systems exhibiting chaotic dynamics due to the presence of uniformly hyperbolic attractors are presented as examples. © 2011 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences.

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