Results for "Victor I. Kolobov"

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Weak, Strong and Linear Convergence of a Double-Layer Fixed Point AlgorithmMar 28 2017In this article we consider a consistent convex feasibility problem in a real Hilbert space defined by a finite family of sets $C_i$. We are interested, in particular, in the case where for each $i$, $C_i=Fix (U_i)=\{z\in \mathcal H\mid p_i(z)=0\}$, $U_i\colon\mathcal ... More
Finitely Convergent Deterministic and Stochastic Methods for Solving Convex Feasibility ProblemsMay 14 2019We propose finitely convergent methods for solving convex feasibility problems defined over a possibly infinite pool of constraints. Following other works in this area, we assume that the interior of the solution set is nonempty and that certain overrelaxation ... More
Linear Convergence Rates for Extrapolated Fixed Point AlgorithmsMay 10 2018We establish linear convergence rates for a certain class of extrapolated fixed point algorithms which are based on dynamic string-averaging methods in a real Hilbert space. This applies, in particular, to the extrapolated simultaneous and cyclic cutter ... More
Fast and Simple Deterministic Algorithms for Highly-Dynamic NetworksJan 13 2019This paper provides a surprisingly simple method for obtaining fast (constant amortized time) deterministic distributed algorithms for a highly-dynamic setting, in which arbitrarily many edge changes may occur in each round. Among the implications of ... More
Fast and Simple Deterministic Algorithms for Highly-Dynamic NetworksJan 13 2019Jul 15 2019This paper provides a simple algorithmic template for obtaining fast distributed algorithms for a highly-dynamic setting, in which arbitrarily many edge changes may occur in each round. Our algorithm significantly improves upon prior work in its combination ... More
Observation of thermal Hawking radiation at the Hawking temperature in an analogue black holeSep 04 2018Sep 14 2018We measure the correlation spectrum of the Hawking radiation emitted by an analogue black hole and find it to be thermal at the Hawking temperature implied by the analogue surface gravity. The Hawking radiation is in the regime of linear dispersion, in ... More
Squeezed-light source for the superresolving microscopyJan 06 2004We propose a source of multimode squeezed light that can be used for the superresolving microscopy beyond the standard quantum limit. This source is an optical parametric amplifier with a properly chosen diaphragm on its output and a Fourier lens. We ... More
Electrostatic PIC with adaptive Cartesian meshApr 26 2016We describe an initial implementation of an electrostatic Particle-in-Cell (ES-PIC) module with adaptive Cartesian mesh in our Unified Flow Solver framework. Challenges of PIC method with cell-based adaptive mesh refinement (AMR) are related to a decrease ... More
Towards single-cycle squeezing in chirped quasi-phase-matched optical parametric down-conversionMay 06 2013We propose a method for generation of a single-cycle squeezed light by parametric down-conversion in a chirped quasi-phase-matched nonlinear crystal. We find an exact quantum solution for this process valid for an arbitrary parametric gain, and discover ... More
Adaptive Kinetic-Fluid Models for Expanding PlasmasJan 15 2018We describe gas dynamic and plasma effects for transient plasma jets under different conditions. Our Unified Flow Solver (UFS) is evaluated for simulations of mixed continuum-rarefied flows, transient gas expansion dynamics and collisionless plasma expansion. ... More
Oscillations Above Sunspots and Faculae: Height Stratification and Relation to Coronal Fan StructureNov 23 2014Oscillation properties in two sunspots and two facular regions are studied using Solar Dynamics Observatory (SDO) data and ground-based observations in the SiI 10827 and HeI 10830 lines. The aim is to study different-frequency spatial distribution characteristics ... More
Peculiarity of the oscillation stratification in sunspot penumbraeJul 21 2016Spatial distributions of the dominant oscillation frequency obtained for four sunspots show a feature shared by all the analysed levels of the solar atmosphere in these sunspots. This feature located in the inner penumbrae indicates that this region has ... More
Tripartite entanglement in parametric down-conversion with spatially-structured pumpFeb 09 2010Most investigations of multipartite entanglement have been concerned with temporal modes of the electromagnetic field, and have neglected its spatial structure. We present a simple model which allows to generate tripartite entanglement between spatial ... More
Quantum teleportation of qudits by means of generalised quasi-Bell states of lightFeb 27 2019Quantum superpositions of coherent states are produced both in microwave and optical domains, and are considered realizations of the famous "Schr\"odinger cat" state. The recent progress shows an increase in the number of components and the number of ... More
Quantum effects of operator time ordering in the nonlinear Jaynes-Cummings modelSep 12 2018Recently, in [Phys. Rev. A 97, 043806 (2018)], the detuned and nonlinear Jaynes-Cummings model describing the quantized motion of a trapped ion was introduced and its corresponding dynamics was solved via considering the driving laser in a quantized manner. ... More
Kinetic Solvers with Adaptive Mesh in Phase SpaceApr 11 2013Oct 18 2013An Adaptive Mesh in Phase Space (AMPS) methodology has been developed for solving multi-dimensional kinetic equations by the discrete velocity method. A Cartesian mesh for both configuration (r) and velocity (v) spaces is produced using a tree of trees ... More
Influence of the Magnetic Field on Oscillation Spectra in Solar FaculaeJul 07 2016Jul 15 2016In this work, we studied oscillation parameters in faculae above magnetic knots and in the adjacent to them areas. Using SDO data we analysed oscillations in magnetic strength, Doppler velocity, and intensity signals for the lower photosphere, and in ... More
Oscillations above sunspots from the temperature minimum to the coronaMay 21 2013Context. An analysis of the oscillations above sunspots was carried out using simultaneous ground-based and Solar Dynamics Observatory (SDO) observations (SiI 10827A, HeI 10830A, FeI 6173A, 1700A, HeII 304A, FeIX 171A). Aims. Investigation of the spatial ... More
Quantum temporal imaging: application of a time lens to quantum opticsApr 02 2017We consider application of a temporal imaging system, based on the sum-frequency generation, to a nonclassical, in particular, squeezed optical temporal waveform. We analyze the restrictions on the pump and the phase matching condition in the summing ... More
Quantum parallel dense coding of optical imagesJan 13 2005We propose quantum dense coding protocol for optical images. This protocol extends the earlier proposed dense coding scheme for continuous variables [S.L.Braunstein and H.J.Kimble, Phys.Rev.A 61, 042302 (2000)] to an essentially multimode in space and ... More
Quantum Holographic Teleportation of Light FieldsJul 10 2000We describe a continious variable teleportation scheme that allows to teleport the quantum state of distributed in space-time multimode electromagnetic field. Our teleportation protocol uses the spatially-multimode entangled Einstein-Podolsky-Rosen lihgt ... More
Height distribution of the power of 3-min oscillations over sunspotsNov 29 2011Context. The height structure of 3-min oscillations over sunspots is studied in the context of the recently discovered effect of height inversion: over the umbra, the spatial location of the maximum of chromospheric 3-min oscillation power corresponds ... More
Polarization squeezing in vertical-cavity surface-emitting lasersJul 01 2004We further elaborate the theory of quantum fluctuations in vertical-cavity surface-emitting lasers (VCSELs), developed in Ref. \cite{Hermier02}. In particular, we introduce the quantum Stokes parameters to describe the quantum self- and cross-correlations ... More
A Discontinuous Galerkin Time-Domain Method with Dynamically Adaptive Cartesian Meshes for Computational ElectromagneticsApr 26 2016A discontinuous Galerkin time-domain (DGTD) method based on dynamically adaptive Cartesian meshes (ACM) is developed for a full-wave analysis of electromagnetic fields in dispersive media. Hierarchical Cartesian grids offer simplicity close to that of ... More
Thermal-difference states of light: quantum states of heralded photonsJun 23 2019Aug 05 2019We introduce the thermal-difference states (TDS), a three-parameter family of single-mode non-Gaussian bosonic states whose density operator is a weighted difference of two thermal states. We show that the states of ``heralded photons'' generated via ... More
Transition nucleon resonance electrocouplings from CLAS data on $π^{+}π^{-}p$ electroproduction off protonsOct 04 2010Electrocouplings of excited proton states with masses less than 1.8 GeV were determined for the first time from the CLAS data on $\pi^+\pi^-p$ electroproduction at photon virtualities $Q^2$ $<$ 1.5 GeV$^2$. Electrocouplings were obtained from a combined ... More
New Method for Building Geodesic Lines in Riemann GeometryAug 08 2016New perspective form of equations for geodesic lines in Riemann Geometry was found. This method is based on the use of differential forms in differential equations as arguments of differentiation. At that, these forms do not have a requirement of completeness, ... More
Nucleon Resonance Structure from Exclusive Meson Electroproduction with CLASJan 29 2018Feb 01 2018Studies of the nucleon resonance electroexcitation amplitudes in a wide range of photon virtualities offer unique information on many facets of strong QCD behind the generation of all prominent excited nucleon states. Advances in the evaluation of resonance ... More
Influence of magnetic field on paramagnetic-ferromagnetic transition in La$_{1-x}$Ca$_{x}$MnO$_{3}$ ($x\approx 0.25$) crystal: ultrasonic and transport studiesJul 28 2006The ultrasonic properties of La$_{1-x}$Ca$_{x}$MnO$_{3}$ ($x\approx 0.25$) with the Curie temperature $T_C$ about 200 K are studied. Temperature dependences of longitudinal and transverse sound velocities were measured in zero magnetic field and for different ... More
Disorder and Quantum Fluctuations in Superconducting Films in Strong Magnetic FieldsApr 13 2001We find that the upper critical field in a two-dimensional disordered superconductor can increase essentially at low temperatures. This happens due to the formation of local superconducting islands weakly coupled via the Josephson effect. The distribution ... More
Spin glass versus superconductivityApr 09 2002A superconductor with interacting paramagnetic impurities is considered. The impurities are coupled via the Ruderman-Kittel-Kasuya-Yoshida interaction. At a temperature Tg, the system of magnetic impurities forms a spin-glass state. We study the effect ... More
Koszul incidence algebras, affine semigroups, and Stanley-Reisner idealsApr 10 2009Feb 07 2010We prove a theorem unifying three results from combinatorial homological and commutative algebra, characterizing the Koszul property for incidence algebras of posets and affine semigroup rings, and characterizing linear resolutions of squarefree monomial ... More
Broadband bright twin beams and their up-conversionOct 23 2017Oct 24 2017We report on the observation of broadband (40 THz) bright twin beams through high-gain parametric down-conversion in an aperiodically poled lithium niobate crystal. The output photon number is shown to scale exponentially with the pump power and not with ... More
Carrier Multiplication in Nanocrystals via Photostimulated Generation of Biexcitons from VacuumJul 13 2007We propose a novel mechanism for photogeneration of multiexcitons by single photons (carrier multiplication) in semiconductor nanocrystals. In this mechanism, the Coulomb interaction between two valence-band electrons involving their transfer to the conduction ... More
Neutron scattering and superconducting order parameter in YBa2Cu3O7Feb 06 1995Apr 25 1996We discuss the origin of the neutron scattering peak at 41 meV observed in YBa$_2$Cu$_3$O$_7$ below $T_c$. The peak may occur due to spin-flip electron excitations across the superconducting gap which are enhanced by the antiferromagnetic interaction ... More
Computing the Scaling Exponents in Fluid Turbulence from First Principles: Demonstration of Multi-scalingAug 05 1997This manuscript is a draft of work in progress, meant for network distribution only. It will be updated to a formal preprint when the numerical calculations will be accomplished. In this draft we develop a consistent closure procedure for the calculation ... More
Trapping of Atoms by the Counter-Propagating Stochastic Light WavesOct 06 2016We show that the field of counter-propagating stochastic light waves, one of which repeats the other, can form an one-dimension trap for atoms. The confinement of an ensemble of atoms in the trap and their simultaneous cooling can be achieved without ... More
Hard exclusive two photon processes in QCDSep 11 2014Oct 07 2014This is a short review of some hard two-photon processes: $\\ a) \,\,\gamma\gamma\to {\overline P}_1 P_2,\,\, {\overline P}_1 P_2= \{\pi^+\pi^-, K^+ K^-, K_S K_S, \pi^o\pi^o, \pi^o\eta\}\,, \\ b) \,\,\gamma\gamma\to V_1 V_2,\,\, V_1 V_2=\{\rho^o\rho^o, ... More
Strong McKay Correspondence, String-theoretic Hodge Numbers and Mirror SymmetryOct 04 1994Nov 22 1994In the revised version of the paper, we correct misprints and add some new statements.
The group classification of one class of nonlinear wave equationsOct 23 2003Oct 27 2003The problem of group classification of one class of quasilinear equations of hyperbolic type with two independent variables has been solved completely.
ArduSoar: an Open-Source Thermalling Controller for Resource-Constrained AutopilotsFeb 22 2018Aug 21 2018Autonomous soaring capability has the potential to significantly increase time aloft for fixed-wing UAVs. In this paper, we introduce ArduSoar, the first soaring controller integrated into a major autopilot software suite for small UAVs. We describe ArduSoar ... More
Space-time duality and quantum temporal imagingJun 28 2018Jun 25 2019Using the space-time analogy, we compare the performance of quantum temporal imaging with its classical counterpart. We consider a temporal imaging scheme, based on the sum-frequency generation (SFG) time lens, but our results can be applied to other ... More
Space-time duality and quantum temporal imagingJun 28 2018Using the space-time analogy, we compare the performance of quantum temporal imaging with its classical counterpart. We consider a temporal imaging scheme, based on the sum-frequency generation (SFG) time lens, but our results can be applied to other ... More
Semiempirical charge distribution of clusters in the ion sputtering of metalNov 24 1999Nov 25 1999We propose the generalization of a known established empirically (Wahl W. and Wucher A. Nucl. Instrum. Meth. B 94, 36(1994)) power law, describing relative mass-spectra of neutral sputtered clusters, on the cases of arbitrary cluster charges. The fluctuation ... More
Maxwell-Juttner distribution for rigidly-rotating flows in spherically symmetric spacetimes using the tetrad formalismMay 23 2016Jun 02 2016We consider rigidly rotating states in thermal equilibrium on static spherically symmetric spacetimes. Using the Maxwell-Juttner equilibrium distribution function, onstructed as a solution of the relativistic Boltzmann equation, the equilibrium particle ... More
Twist Defect in Chiral Photonic StructuresOct 18 2002We demonstrate that twisting one part of a chiral photonic structure about its helical axis produces a single circularly polarized localized mode that gives rise to an anomalous crossover in propagation. Up to a crossover thickness, this defect results ... More
Quasifinite representations of W_{\infty}Oct 29 1999We classify the quasifinite highest weight modules over a family of subalgebras W_{\infty}^{n} of the central extension W_{1+\infty} of the Lie algebra of differential operators on the circle consisting of operators of order \geq n. We classify the unitary ... More
Spectral stability of higher order uniformly elliptic operatorsApr 12 2012We prove estimates for the variation of the eigenvalues of uniformly elliptic operators with homogeneous Dirichlet or Neumann boundary conditions upon variation of the open set on which an operator is defined. We consider operators of arbitrary even order ... More
Artificial gauge fields with ultracold atomsJan 11 2019Gauge fields are ubiquitous in nature. In the context of quantum electrodynamics, you may be most familiar with the photon, which represents the gauge field mediating electromagnetic forces. But there are also gluons, which mediate strong forces, and ... More
Boltzmann-Fokker-Planck Kinetic Solver with Adaptive Mesh in Phase SpaceOct 22 2018Feb 19 2019We describe the implementation of kinetic solvers in 1d2v phase space using adaptive Cartesian mesh. Spherical coordinates in velocity space are used to simplify the Lorentz and Fokker-Planck collisional operators. The key capabilities of the new solvers ... More
Capture of atoms and small particles in an optical trap formed by sequences of counter-propagating light pulses with a large areaSep 29 2012A new trap for atoms and small particles based on the interaction between an atom and the field of counter-propagating light pulses that are partially superposed in time has been proposed. A substantial difference from the known analogs consists in that ... More
To the positive miscut influence on the crystal collimation efficiencySep 23 2011Sep 26 2011The paper concerns the crystal based collimation suggested to upgrade the Large Hadron Collider collimation system. The issue of collimation efficiency dependence on the muscut angle characterizing nonparallelity of the channeling planes and crystal surface ... More
Decays of Pentaquarks in Hadrocharmonium and Molecular PicturesNov 05 2018Dec 31 2018We consider decays of the hidden charm LHCb pentaquarks in the hadrocharmonium and molecular scenarios. In both pictures the LHCb pentaquarks are essentially nonrelativistic bound states. We develop a semirelativistic framework for calculation of the ... More
Information metric from Riemannian superspacesJun 11 2012The Fisher's information metric is introduced in order to find the real meaning of the probability distribution in classical and quantum systems described by Riemaniann non-degenerated superspaces. In particular, the physical r\^{o}le played by the coefficients ... More
Kinetic Solvers with Adaptive Mesh in Phase Space for Low-Temperature PlasmasSep 13 2018We describe the implementation of 1d1v and 1d2v Vlasov and Fokker-Planck kinetic solvers with adaptive mesh refinement in phase space (AMPS) and coupling these kinetic solvers to Poisson equation solver for electric field. We demonstrate that coupling ... More
Adaptive Kinetic-Fluid Solvers for Heterogeneous Computing ArchitecturesMar 02 2015Jul 22 2015We show feasibility and benefits of porting an adaptive multi-scale kinetic-fluid code to CPU-GPU systems. Challenges are due to the irregular data access for adaptive Cartesian mesh, vast difference of computational cost between kinetic and fluid cells, ... More
Asymmetric universal entangling machineDec 23 2004We give a definition of asymmetric universal entangling machine which entangles a system in an unknown state to a specially prepared ancilla. The machine produces a fixed state-independent amount of entanglement in exchange to a fixed degradation of the ... More
Nanoplasmonic Renormalization and Enhancement of Coulomb InteractionsFeb 02 2008Nanostructured plasmonic metal systems are known to enhance greatly variety of radiative and nonradiative optical processes, both linear and nonlinear, which are due to the interaction of an electron in a molecule or semiconductor with the enhanced local ... More
Representations of simple finite Lie conformal superalgebras of type W and SMar 23 2010May 11 2010We construct all finite irreducible modules over Lie conformal superalgebras of type W and S.
Large Coherence Area Thin-Film Photonic Stop-Band LasersSep 29 2000We demonstrate that the shift of the stop band position with increasing oblique angle in periodic structures results in a wide transverse exponential field distribution corresponding to strong angular confinement of the radiation. The beam expansion follows ... More
Irreducible modules over finite simple Lie conformal superalgebras of type KMar 23 2010We construct all finite irreducible modules over Lie conformal superalgebras of type K
Aharonov-Bohm effect as a probe of interaction between magnetic impuritiesJun 30 2004We study the effects of the RKKY interaction between magnetic impurities on the mesoscopic conductance fluctuations of a metal ring with dilute magnetic impurities. At sufficiently low temperatures and strong magnetic fields, the loss of electron coherence ... More
Pentaquarks with hidden charm as hadroquarkoniaSep 27 2017Jan 16 2018We consider hidden charm pentaquarks as hadroquarkonium states in a QCD inspired approach. Pentaquarks arise naturally as bound states of quarkonia excitations and ordinary baryons. The LHCb $P_c(4450)$ pentaquark is interpreted as a $\psi'$-nucleon bound ... More
From Pixels to Sentiment: Fine-tuning CNNs for Visual Sentiment PredictionApr 12 2016Jan 27 2017Visual multimedia have become an inseparable part of our digital social lives, and they often capture moments tied with deep affections. Automated visual sentiment analysis tools can provide a means of extracting the rich feelings and latent dispositions ... More
Autowaves in the model of avascular tumour growthMay 18 2007A mathematical model of infiltrative tumour growth taking into account cell proliferation, death and motility is considered. The model is formulated in terms of local cell density and nutrient (oxygen) concentration. In the model the rate of cell death ... More
Finite growth representations of infinite Lie conformal algebrasOct 10 2002We classify all finite growth representations of all infinite rank subalgebras of the Lie conformal algebra gc_1 that contain a Virasoro subalgebra.
Time- and Polarization-Resolved Optical Spectroscopy of Colloidal CdSe Nanocrystal Quantum Dots in High Magnetic FieldsNov 28 2005In an effort to elucidate the spin (rather than charge) degrees of freedom in colloidal semiconductor nanocrystal quantum dots, we report on a series of static and time-resolved photoluminescence measurements of colloidal CdSe quantum dots in ultra-high ... More
Nucleon Resonance Electrocouplings from the CLAS Data on Exclusive Meson Electroproduction off ProtonsSep 06 2011$\gamma_{v}NN^*$ transition helicity amplitudes (electrocouplings) of several prominent excited proton states are determined for the first time in independent analyses of $\pi^+n$, $\pi^0p$, and $\pi^+\pi^-p$ electroproduction off protons. Analysis of ... More
Embedded Topological InsulatorsFeb 19 2018We present a generalization of free fermionic topological insulators that are composed of topological subsystems of differing dimensionality. We specifically focus on topological subsystems of nonzero co-dimension are embedded within a trivial insulating ... More
Coherent gigahertz phonons in Ge$_{2}$Sb$_{2}$Te$_{5}$ phase-change materialsOct 07 2015Using $\approx$40 fs ultrashort laser pulses, we investigate the picosecond acoustic response from a prototypical phase change material, thin Ge$_{2}$Sb$_{2}$Te$_{5}$ (GST) films with various thicknesses. After excitation with a 1.53 eV-energy pulse with ... More
Classification of finite irreducible modules over the Lie conformal superalgebra CK6Oct 18 2011We classify all continuous degenerate irreducible modules over the exceptional linearly compact Lie superalgebra E(1, 6), and all finite degenerate irreducible modules over the exceptional Lie conformal superalgebra CK6, for which E(1, 6) is the annihilation ... More
On-chip spectropolarimetry by fingerprinting with random surface arrays of nanoparticlesSep 22 2017Optical metasurfaces revolutionized the approach to moulding the propagation of light by enabling simultaneous control of the light phase, momentum, amplitude and polarization. Thus, instantaneous spectropolarimetry became possible by conducting parallel ... More
A writer-independent approach for offline signature verification using deep convolutional neural networks featuresJul 26 2018The use of features extracted using a deep convolutional neural network (CNN) combined with a writer-dependent (WD) SVM classifier resulted in significant improvement in performance of handwritten signature verification (HSV) when compared to the previous ... More
Bloch-Messiah decomposition and Magnus expansion for parametric down-conversion with monochromatic pumpJun 25 2018We discuss the Bloch-Messiah decomposition for the broadband squeezed light generated by type-I parametric down-conversion with monochromatic pump. Using an exact solution for this process, we evaluate the squeezing parameters and the corresponding squeezing ... More
Generation of monocycle squeezed light in chirped quasi-phase-matched nonlinear crystalsMar 23 2017We present a quantum theory of parametric down-conversion of light in chirped quasi-phase-matched second-order nonlinear crystals with undepleted quasi-monochromatic pump. This theory allows us to consider generation of ultrabroadband squeezed states ... More
Phenomenological interpretations of the ac Hall effect in the normal state of YBa2Cu3O7Jun 03 1997Dec 08 1997Ac and dc magnetotransport data in the normal state of YBa2Cu3O7 are analyzed within Fermi-liquid and non-Fermi-liquid models. In the Fermi-liquid analysis we use the Fermi surface deduced from band structure calculations and angular resolved photoemission ... More
Disentangling Motion, Foreground and Background Features in VideosJul 13 2017Jul 17 2017This paper introduces an unsupervised framework to extract semantically rich features for video representation. Inspired by how the human visual system groups objects based on motion cues, we propose a deep convolutional neural network that disentangles ... More
A correspondence between modified gravity and General Relativity with scalar fieldsOct 09 2018Jan 22 2019We describe a novel procedure to map the field equations of nonlinear Ricci-based metric-affine theories of gravity, coupled to scalar matter described by a given Lagrangian, into the field equations of General Relativity coupled to a different scalar ... More
New bounds on neutrino electric millicharge from GEMMA experiment on neutrino magnetic momentNov 09 2014Using the new limit on the neutrino anomalous magnetic moment recently obtained by GEMMA experiment we get an order-of-magnitude estimation for possible new direct upper bound on the neutrino electric millicharge $\mid q_{\nu} \mid \sim 1.5 \times 10^{-12} ... More
Optical Pulse Dynamics in Active Metamaterials with Positive and Negative Refractive IndexFeb 01 2013We study numerically the propagation of two-color light pulses through a metamaterial doped with active atoms such that the carrier frequencies of the pulses are in resonance with two atomic transitions in the $\Lambda$ configuration and that one color ... More
Microstate Counting of $AdS_4$ Hyperbolic Black Hole Entropy via the Topologically Twisted IndexJan 26 2017Feb 06 2017We compute the topologically twisted index for general $\mathcal{N} = 2$ supersymmetric field theories on $\mathbb{H}_2\times S^1$. We also discuss asymptotically $AdS_4$ magnetically charged black holes with hyperbolic horizon, in four-dimensional $\mathcal{N} ... More
Abelian Tensor Models on the LatticeMay 04 2017May 07 2018We consider a chain of Abelian Klebanov-Tarnopolsky fermionic tensor models coupled through quartic nearest-neighbor interactions. We characterize the gauge-singlet spectrum for small chains ($L=2,3,4,5$) and observe that the spectral statistics exhibits ... More
Mapping nonlinear gravity into General Relativity with nonlinear electrodynamicsJul 17 2018Oct 26 2018We show that families of nonlinear gravity theories formulated in a metric-affine approach and coupled to a nonlinear theory of electrodynamics can be mapped into General Relativity (GR) coupled to another nonlinear theory of electrodynamics. This allows ... More
A possible mechanism of ultrafast amorphization in phase-change memory alloys: an ion slingshot from the crystalline to amorphous positionMar 14 2008We propose that the driving force of an ultrafast crystalline-to-amorphous transition in phase-change memory alloys are strained bonds existing in the (metastable) crystalline phase. For the prototypical example of GST, we demonstrate that upon breaking ... More
The effect of Auger heating on intraband carrier relaxation in semiconductor quantumrodsAug 17 2006The rate at which excited charge carriers relax to their equilibrium state affects many aspects of the performance of nanoscale devices, including switching speed, carrier mobility and luminescent efficiency. Better understanding of the processes that ... More
Active Electrically Small Antenna Based on Superconducting Quantum ArrayNov 29 2012We introduce Superconductive Quantum Arrays (SQAs) and propose to use these structures as active Electrically Small Antennas (ESA). Several prototypes of the active ESA were fabricated using Nb process with critical current density 4.5 kA/cm2 and experimentally ... More
Spatial distribution of atoms in the field of the criss-cross standing bichromatic light wavesDec 05 2018We show that properly detuning the carrier frequency of each of the criss-cross bichromatic waves from the transition frequency of the atom, it is possible to form a two-dimensional trap for atoms if the intensity of the waves is sufficiently large. For ... More
SCORPIO-2 Guiding and Calibration System in the Prime Focus of the 6-m TelescopeNov 09 2017We describe a device (adapter) for off-axis guiding and photometric calibration of wide-angle spectrographs operating in the prime focus of the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. To compensate coma ... More
Skip RNN: Learning to Skip State Updates in Recurrent Neural NetworksAug 22 2017Feb 05 2018Recurrent Neural Networks (RNNs) continue to show outstanding performance in sequence modeling tasks. However, training RNNs on long sequences often face challenges like slow inference, vanishing gradients and difficulty in capturing long term dependencies. ... More
New scalar compact objects in Ricci-based gravity theoriesJun 11 2019Taking advantage of a previously developed method, which allows to map solutions of General Relativity into a broad family of theories of gravity based on the Ricci tensor (Ricci-based gravities), we find new exact analytical scalar field solutions by ... More
n-body dynamics of stabilized vector solitonsDec 03 2004In this work we study the interactions between stabilized Townes solitons. By means of effective Lagrangian methods, we have found that the interactions between these solitons are governed by central forces, in a first approximation. In our numerical ... More
Raman scattering study of the a-GeTe structure and possible mechanism for the amorphous-to-crystal transitionFeb 07 2006We report on an inelastic (Raman) light scattering study of the local structure of amorphous GeTe films. A detailed analysis of the temperature-reduced Raman spectra has shown that appreciable structural changes occur as a function of temperature. These ... More
Room temperature coherent spin alignment of silicon vacancies in 4H- and 6H-SiCFeb 27 2012Jun 08 2012We report the realization of the optically induced inverse population of the ground-state spin sublevels of the silicon vacancies ($V_{\mathrm{Si}}$) in silicon carbide (SiC) at room temperature. The data show that the probed silicon vacancy spin ensemble ... More
Tunable magnetic exchange interactions in manganese-doped inverted core/shell ZnSe/CdSe nanocrystalsNov 06 2008Magnetic doping of semiconductor nanostructures is actively pursued for applications in magnetic memory and spin-based electronics. Central to these efforts is a drive to control the interaction strength between carriers (electrons and holes) and the ... More
Transient Spectroscopy of Glass-Embedded Perovskite Quantum Dots: Novel Structures in an Old WrappingDec 03 2018Semiconductor doped glasses had been used by the research and engineering communities as color filters or saturable absorbers well before it was realized that their optical properties were defined by tiny specs of semiconductor matter known presently ... More
More cat than cute? Interpretable Prediction of Adjective-Noun PairsAug 21 2017The increasing availability of affect-rich multimedia resources has bolstered interest in understanding sentiment and emotions in and from visual content. Adjective-noun pairs (ANP) are a popular mid-level semantic construct for capturing affect via visually ... More
Coherent Dirac plasmons in topological insulatorsApr 25 2018We explore the ultrafast reflectivity response from photo-generated coupled phonon-surface Dirac plasmons in Sb$_2$Te$_3$ topological insulators several quintuple layers thick. The transient coherent phonon spectra obtained at different time frames exhibit ... More
A topological phase buried in a chalcogenide superlattice monitored by a helicity dependent Kerr measurementJul 27 2019Chalcogenide superlattices (SL), formed by the alternate stacking of GeTe and Sb$_{2}$Te$_{3}$ layers, also referred to as interfacial phase change memory (iPCM), are a leading candidate for spin based memory device applications. Theoretically, the iPCM ... More
All-optical detection of periodic structure of chalcogenide superlattice using coherent folded acoustic phononsJul 29 2019Chalcogenide superlattices (SL) consist of alternate stacking of GeTe and Sb$_{2}$Te$_{3}$ layers. The structure can become a 3D topological insulator depending on the constituent layer thicknesses, making the design of the SL period a central issue for ... More
Exact and approximate analytical solutions of Weiss equation of ferromagnetism and their experimental relevanceFeb 14 2017The recent progress in the theory of generalized Lambert functions makes possible to solve exactly the Weiss equation of ferromagnetism. However, this solution is quite inconvenient for practical purposes. Precise approximate analytical solutions are ... More