Results for "A. A. Zhukov"

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Large Scale (~25 m^2) metal diffraction grating of submicron period as possible optoelectronic detector for short scalar gravitational wavesNov 24 2014Nov 25 2014A method of detecting of short scalar gravitational waves with a wavelength of ~ 0.5 micrometers is proposed, in contrast to LIGO Project, aimed at detecting of long quadrupole gravitational waves with a wavelength in interval from 43 till 10000 km. The ... More
Random Forest Based Approach for Concept Drift HandlingFeb 14 2016Concept drift has potential in smart grid analysis because the socio-economic behaviour of consumers is not governed by the laws of physics. Likewise there are also applications in wind power forecasting. In this paper we present decision tree ensemble ... More
Current perpendicular to plane Giant Magnetoresistance (GMR) in laminated nanostructuresNov 23 2004We theoretically studied spin dependent electron transport perpendicular-to-plain (CPP) in magnetic laminated multilayered structures by using Kubo formalism. We took into account not only bulk scattering, but the interface resistance due to both specular ... More
Influence of misalignments on performance of externally occulted solar coronagraphs. Application to PROBA-3/ASPIICSJan 12 2018ASPIICS is a novel externally occulted coronagraph that will be launched onboard the PROBA-3 mission of ESA. The external occulter (EO) will be placed on one satellite ~150 m ahead of the second satellite with an optical instrument. During part of each ... More
Novel surface anisotropy term in the FMR spectra of amorphous microwiresApr 08 2003Some recent publications on ferromagnetic resonance in amorphous wires mention presumably new kind of anisotropy, called there circumferential anisotropy, as an explanation of various spectral features. In this paper we argue that there is no special ... More
Tunnel field effect transistor on a quantum well formed by three layers of graphene derivatives (COH)n-(CF)n-(CH)n, with the drain from the middle layer - (CF)nJan 05 2015In the paper the version of the field effect tunnel nano transistor on quantum well is researched, where the control voltage is applied to the barriers surrounding the quantum well, and electron drain comes from the quantum well. Electrons tunnel into ... More
Thin Film Motion of an Ideal Fluid on the Rotating Cylinder SurfaceMar 10 2013The shallow water equations describing the motion of thin liquid film on the rotating cylinder surface are obtained. These equations are the analog of the modified Boussinesq equations for shallow water and the Korteweg-de Vries equation. It is clear ... More
Operationalistic Orthogonality Condition for Single-Mode Biphotons (Qutrits)May 20 2003An arbitrary polarization state of a single-mode biphoton is considered. The operationalistic criterion is formulated for the orthogonality og these states. It can be used to separate a biphoton with an arbitrary degree of polarization from a set of biphotons ... More
Four-Probe Measurements of Carbon Nanotubes with Narrow Metal ContactsSep 16 2007We find that electrons in single-wall carbon nanotubes may propagate substantial distances (tens of nanometers) under the metal contacts. We perform four-probe transport measurements of the nanotube conductance and observe significant deviations from ... More
Ignition Delay Times of Kerosene (Jet-A)/Air MixturesAug 23 2012Mar 17 2014Ignition of Jet-A/air mixtures was studied behind reflected shock waves. Heating of shock tube at temperature of 150 C was used to prepare a homogeneous fuel mixture. Ignition delay times were measured from OH emission at 309 nm and from absorption of ... More
SU(4) and SU(2) Kondo Effects in Carbon Nanotube Quantum DotsSep 09 2007We study the SU(4) Kondo effect in carbon nanotube quantum dots, where doubly degenerate orbitals form 4-electron ``shells''. The SU(4) Kondo behavior is investigated for one, two and three electrons in the topmost shell. While the Kondo state of two ... More
Modeling dynamics of entangled physical systems with superconducting quantum computerOct 26 2017We implement several quantum algorithms in real five-qubit superconducting quantum processor IBMqx4 to perform quantum computation of the dynamics of spin-1/2 particles interacting directly and indirectly through the boson field. Particularly, we focus ... More
Anomalous pH-gradient in Ampholyte SolutionFeb 21 2009A mathematical model describing a steady pH-gradient in the solution of ampholytes in water has been studied with the use of analytical, asymptotic, and numerical methods. We show that at the large values of an electric current a concentration distribution ... More
Thomas-Ehrman effect in a three-body model: $^{16}$Ne caseNov 07 2014Dec 17 2014The dynamic mechanism of the Thomas-Ehrman shift is studied in three-cluster systems by example of $^{16}$Ne and $^{16}$C isobaric mirror partners. We predict configuration mixings for $0^+$ and $2^+$ states in $^{16}$Ne and $^{16}$C. Large isospin symmetry ... More
A new Determination of the Extragalactic Background of Diffuse Gamma Rays taking into account Dark Matter AnnihilationMay 01 2007May 11 2007The extragalactic background (EGB) of diffuse gamma rays can be determined by subtracting the Galactic contribution from the data. This requires a Galactic model (GM) and we include for the first time the contribution of dark matter annihilation (DMA), ... More
Orthogonal localized wave functions of an electron in a magnetic fieldMar 06 1996Jun 04 1996We prove the existence of a set of two-scale magnetic Wannier orbitals w_{m,n}(r) on the infinite plane. The quantum numbers of these states are the positions {m,n} of their centers which form a von Neumann lattice. Function w_{00}localized at the origin ... More
Low polarized emission from the core of coronal mass ejectionsMay 17 2011In white-light coronagraph images, cool prominence material is sometimes observed as bright patches in the core of coronal mass ejections (CMEs). If, as generally assumed, this emission is caused by Thomson-scattered light from the solar surface, it should ... More
Dynamics of Activated Escape, and Its Observation in a Semiconductor LaserFeb 02 2000We report a direct experimental observation and provide a theory of the distribution of trajectories along which a fluctuating system moves over a potential barrier in escape from a metastable state. The experimental results are obtained for a semiconductor ... More
Modeling of zonal electrophoresis in plane channel of complex shapeFeb 21 2009The zonal electrophoresis in the channels of complex forms is considered mathematically with the use of computations. We show that for plane S-type rectangular channels stagnation regions can appear that cause the strong variations of the spatial distribution ... More
Modeling and removal of optical ghosts in the PROBA-3/ASPIICS externally occulted solar coronagraphDec 10 2018Context: ASPIICS is a novel externally occulted solar coronagraph, which will be launched onboard the PROBA-3 mission of the European Space Agency. The external occulter will be placed on the first satellite approximately 150 m ahead of the second satellite ... More
Rotating electrohydrodynamic flow in a suspended liquid filmFeb 21 2009The mathematical model of a rotating electrohydrodynamic flow in a thin suspended liquid film is proposed and studied. The motion is driven by the given difference of potentials in one direction and constant external electrical field $\vE_\text{out}$ ... More
Observation of the fine structure for rovibronic spectral lines in visible part of emission spectra of $D_2$Dec 02 2011Mar 12 2012For the first time in visible part of the $D_2$ emission spectrum the pseudo doublets representing partly resolved fine structure of rovibronic lines have been observed. They are characterized by splitting values about 0.2 cm$^{-1}$ and relative intensity ... More
Quantum communication protocols as a benchmark for quantum computersDec 03 2018We point out that realization of quantum communication protocols in programmable quantum computers provides a deep benchmark for capabilities of real quantum hardware. Particularly, it is prospective to focus on measurements of entropy-based characteristics ... More
The electronic transport of top subband and disordered sea in InAs nanowire in presence of a mobile gateSep 10 2013Sep 14 2013We performed measurements at helium temperatures of the electronic transport in an InAs quantum wire ($R_{wire} \sim 30$\,k$\Omega$) in the presence of a charged tip of an atomic force microscope serving as a mobile gate. The period and the amplitude ... More
Hole Conductivity in Heterogeneous DNA FragmentsJul 31 2013The characteristics of cation radical (hole) migration in heterogeneous DNA were investigated on the basis of Kubo formula, in which correlation functions were obtained from solutions of systems of Bogoliubov hierarchy. The cutting of Bogoliubov hierarchy ... More
Correlations of mutual positions of charge density waves nodes in side-by-side placed InAs wires measured with scanning gate microscopyApr 24 2015We investigate the correlations of mutual positions of charge density waves nodes in side-by-side placed InAs nanowires in presence of a conductive atomic force microscope tip served as a mobile gate at helium temperatures. Scanning gate microscopy scans ... More
Commensurability effects induced by a periodic array of nanoscale anti-dots in Nb superconductorOct 22 2003We study the interactions of the vortex lattice with a periodic square array of holes in a superconducting Nb film using magnetic and resistive measurements. Three different temperature regions have been observed. They are governed by interplay between ... More
Practical Realization of the Quantum Cryptography Protocol Exploiting Polarization Encoding in the QutritsMay 20 2003We propose and discuss a specific scheme allowing to realize a Quantum Cryptography qutrit protocol. This protocol exploits the polarization properties of single frequency and single spatial mode biphotons.
Lock-in to commensurate states induced by a periodic array of nanoscale anti-dots in Nb superconductorJul 25 2002We study the interactions of the vortex lattice with a periodic square array of holes in a superconducting Nb film. Using high resolution magnetic field measurements of electrical losses, extremely narrow states with a magnetic field width reaching 1% ... More
Investigations of local electronic transport in InAs nanowires by scanning gate microscopy at helium temperaturesMay 30 2014In the current paper a set of experiments dedicated to investigations of local electronic transport in undoped InAs nanowires at helium temperatures in the presence of a charged atomic-force microscope tip is presented. Both nanowires without defects ... More
Algorithmic simulation of far-from-equilibrium dynamics using quantum computerJul 25 2018We point out that superconducting quantum computers are prospective for the simulation of the dynamics of spin models far from equilibrium, including nonadiabatic phenomena and quenches. The important advantage of these machines is that they are programmable, ... More
Dynamical Lamb Effect in a Tunable Superconducting Qubit-Cavity SystemMar 05 2015May 04 2015A natural atom placed into a cavity with time-dependent parameters can be parametrically excited due to the interaction with the quantized photon mode. One of the channels of such a process is the dynamical Lamb effect, induced by a nonadiabatic modulation ... More
Identification of single events in the HPGe detector: Comparison of various methods based on the analysis of simulated pulse shapesMar 12 2002Various methods of identification of single events in the HPGe detector are compared on the basis of a program especially designed to simulate pulse shape in a semi-conductor germanium detector. Capabilities of three following methods are shown: (1) an ... More
Superconducting qubit in a nonstationary transmission line cavity: parametric excitation, periodic pumping, and energy dissipationJul 11 2016We consider a superconducting qubit coupled to the nonstationary transmission line cavity with modulated frequency taking into account energy dissipation. Previously, it was demonstrated that in the case of a single nonadiabatical modulation of a cavity ... More
Visibility of Prominences using the HeI D3 Line Filter on PROBA-3/ASPIICS CoronagraphJun 30 2018We determine an optimal width and shape of the narrow-band filter centered around the He\,{\sc i} D$_{3}$ line for prominence and coronal mass ejection (CME) observations with the ASPIICS ({\it Association of Spacecraft for Polarimetric and Imaging Investigation ... More
Results of the experiment on investigation of Germanium-76 double beta decay. Experimental data of Heidelberg-Moscow collaboration November 1995 - August 2001Sep 03 2003On the termination of the Heidelberg-Moscow double-beta decay of Germanium-76 experi-ment, the analysis of the obtained data is presented. The value of the half-life for two-neutrino double beta decay (2b2n mode) and limitation of the half-life for neutrinoless ... More
Superconducting qubit in a nonstationary transmission line cavity: parametric excitation, periodic pumping, and energy dissipationJul 11 2016Dec 18 2016We consider a superconducting qubit coupled to the nonstationary transmission line cavity with modulated frequency taking into account energy dissipation. Previously, it was demonstrated that in the case of a single nonadiabatical modulation of a cavity ... More
Parametrically driven hybrid qubits-photon systems: dissipation-induced quantum entanglement and photon production from vacuumOct 19 2017We consider a dissipative evolution of parametrically-driven qubits-cavity system under the periodical modulation of coupling energy between two subsystems, which leads to the amplification of counterrotating processes. We reveal a very rich dynamical ... More
Dynamical Lamb effect versus dissipation in superconducting quantum circuitsMar 07 2016May 10 2016Superconducting circuits provide a new platform to study nonstationary cavity QED phenomena. An example of such a phenomenon is a dynamical Lamb effect which is a parametric excitation of an atom due to the nonadiabatic modulation of its Lamb shift. This ... More
Dynamics of mesoscopic qubit ensemble coupled to cavity: role of collective dark statesAug 25 2017We consider dynamics of a disordered ensemble of qubits interacting with single mode photon field, which is described by exactly solvable inhomogeneous Dicke model. In particular, we concentrate on the crossover from few-qubit systems to the system of ... More
Suppression of 2D superconductivity by the magnetic field: quantum corrections vs superconductor-insulator transitionMar 24 2003Magnetotransport of superconducting Nd_{2-x}Ce_xCuO_{4+y} (NdCeCuO) films is studied in the temperature interval 0.3-30 K. The microscopic theory of the quantum corrections to conductivity, both in the Cooper and in the diffusion channels, qualitatively ... More
Superconducting anti-dot arrays from self-assembly template methodsOct 20 2003We present results of electrochemical deposition of superconducting Pb in the pores of templates prepared by self-assembly from colloidal suspensions of polystyrene latex spheres. This technique enables us to create highly ordered superconducting nano-structures ... More
Fatigue effect on polarization switching dynamics in polycrystalline bulk ferroelectricsMay 24 2016Jul 11 2016Statistical distribution of switching times is a key information necessary to describe the dynamic response of a polycrystalline bulk ferroelectric to an applied electric field. The Inhomogeneous Field Mechanism (IFM) model offers a useful tool which ... More
Qutrit state engineering with biphotonsMay 28 2004Oct 14 2004The novel experimental realization of three-level optical quantum systems is presented. We use the polarization state of biphotons to generate a specific sequence of states that are used in the extended version of BB84 protocol. We experimentally verify ... More
Metacomposite characteristics and their influential factors of polymer composites containing orthogonal ferromagnetic microwire arraysMar 29 2014The microwave properties of glass-fibers reinforced polymer composite embedded with an orthogonal array of Fe77Si10B10C3 microwires have been investigated. The composites containing orthogonal wire arrays display a remarkable transmission window in the ... More
EGRET Excess of Diffuse Galactic Gamma Rays as Tracer of Dark MatterAug 29 2005The public data from the EGRET space telescope on diffuse Galactic gamma rays in the energy range from 0.1 to 10 GeV are reanalyzed with the purpose of searching for signals of Dark Matter annihilation (DMA). The analysis confirms the previously observed ... More
Ferromagnetic Wires Composite Media with Tunable Scattering Spectra at MicrowavesFeb 27 2006Apr 19 2006We demonstrate composite media with ferromagnetic wires that exhibit a frequency region at the microwave regime with scattering spectra strongly dependent on an external magnetic field or stress. These tunable composite materials have recently been proposed ... More
EGRET Excess of diffuse Galactic Gamma Rays interpreted as a Signal of Dark Matter AnnihilationFeb 15 2006Elsaesser and Mannheim fit a contribution of Dark Matter Annihilation (DMA) to the extragalactic contribution of the galactic diffuse gamma ray flux, as deduced from the EGRET data by Strong, Moskalenko and Reimer.They find a WIMP mass of 515{+110}{-75} ... More
Excess of EGRET Galactic Gamma Ray Data interpreted as Dark Matter AnnihilationAug 15 2004Aug 19 2004The diffuse galactic EGRET gamma ray data show a clear excess for energies above 1 GeV in comparison with the expectations from conventional galactic models. The excess is seen with the same spectrum in all sky directions, as expected for Dark Matter ... More
Sensitivity of three-body decays to the reactions mechanism and the initial structure by example of 6BeNov 22 2012The influence of the initial-state structure and the reaction mechanism on three-body decays is investigated by example of the 6Be continuum populated in neutron-knockout reactions on 7Be. The sensitivity of the 6Be excitation spectrum and the three-body ... More
Transition from direct to sequential two-proton decay in $s$-$d$ shell nucleiMay 03 2016May 09 2016Transitions among different mechanisms of two-proton decay are studied in general. The introduced improved direct-decay model generalizes the semi-analytical models used before and provides flawless phenomenological description of three-body correlations ... More
Two-proton radioactivity and three-body decay. V. Improved momentum distributionsApr 19 2010Jun 04 2010Nowadays quantum-mechanical theory allows one to reliably calculate the processes of 2p radioactivity (true three-body decays) and the corresponding energy and angular correlations up to distances of the order of 1000 fm. However, the precision of modern ... More
The supersymmetric interpretation of the EGRET excess of diffuse Galactic gamma raysNov 12 2005Mar 11 2006Recently it was shown that the excess of diffuse Galactic gamma rays above 1 GeV traces the Dark Matter halo, as proven by reconstructing the peculiar shape of the rotation curve of our Galaxy from the gamma ray excess. This can be interpreted as a Dark ... More
Single ICMEs and Complex Transient Structures in the Solar wind in 2010 -- 2011Feb 16 2018We analyzed statistics, solar sources and properties of interplanetary coronal mass ejections (ICMEs) in the solar wind. In comparison with the first eight years of Cycle 23, during the same period of Cycle 24 the yearly numbers of ICMEs were less correlated ... More
Penetration of Josephson vortices and measurement of the c-axis penetration depth in $Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}$: Interplay of Josephson coupling, surface barrier and defectsJun 23 2000The first penetration field H_{J}(T) of Josephson vortices is measured through the onset of microwave absorption in the locked state, in slightly overdoped $\rm{Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}}$ single crystals (T_{c} ~ 84 K). The magnitude of H_{J}(T) ... More
Horizon-T Experiment Calibrations - CablesAug 15 2016Oct 12 2016An innovative detector system called Horizon-T is constructed to study Extensive Air Showers (EAS) in the energy range above 10^16 eV coming from a wide range of zenith angles (0o - 85o). The system is located at Tien Shan high-altitude Science Station ... More
Horizon-T Experiment Calibrations - CablesAug 15 2016Nov 16 2016An innovative detector system called Horizon-T is constructed to study Extensive Air Showers (EAS) in the energy range above 10^16 eV coming from a wide range of zenith angles (0o - 85o). The system is located at Tien Shan high-altitude Science Station ... More
Dual-band metacomposites containing hybrid Fe and Co-based ferromagnetic microwiresMar 30 2014We investigated the microwave properties of polymer based metacomposites containing hybridized parallel Fe- and Co-based microwire arrays. A dual-band left-handed feature was observed in the frequency bands of 1.5 to 5.5 GHz and 9 to 17 GHz, indicated ... More
Longitudinal and transversal spin dynamics of donor-bound electrons in fluorine-doped ZnSe: spin inertia versus Hanle effectMar 26 2015The spin dynamics of the strongly localized, donor-bound electrons in fluorine-doped ZnSe epilayers is studied by pump-probe Kerr rotation techniques. A method exploiting the spin inertia is developed and used to measure the longitudinal spin relaxation ... More
Dynamics of nuclear spin polarization induced and detected by coherently precessing electron spins in fluorine-doped ZnSeDec 15 2015Jan 11 2016We study the dynamics of optically-induced nuclear spin polarization in a fluorine-doped ZnSe epilayer via time-resolved Kerr rotation. The nuclear polarization in the vicinity of a fluorine donor is induced by interaction with coherently precessing electron ... More
Experimental time-resolved photoemission and ab initio study of lifetimes of excited electrons in Mo and RhApr 04 2006Jul 12 2006We have studied the relaxation dynamics of optically excited electrons in molybdenum and rhodium by means of time resolved two-photon photoemission spectroscopy (TR-2PPE) and ab initio electron self-energy calculations performed within the GW and GW+T ... More
Long-lived spin memory in Mn-doped GaAs: Time resolved studyJul 16 2009We study the electron spin dynamics in p-type GaAs doped with magnetic Mn acceptors by means of time-resolved pump-probe and photoluminescence techniques. Measurements in transverse magnetic fields show a long spin relaxation time of 20 ns that can be ... More
Giant Magnetoimpedance of Glass-Covered Amorphous Microwires of Co-Mn-Si-B and Co-Si-BMay 30 2003A study of magnetic hysteresis and Giant magnetoimpedance (GMI) in amorphous glass covered Co-Si-B and Co-Mn-Si-B wires is presented. The wires, about 10 microns in diameter, were obtained by glass-coated melt spinning technique. Samples with positive ... More
Oscillatory Thickness Dependence of the Coercive Field in Magnetic 3D Anti-Dot ArraysJun 03 2004We present studies on magnetic nano-structures with 3D architectures, fabricated using electrodeposition in the pores of well-ordered templates prepared by self-assembly of polystyrene latex spheres. The coercive field is found to demonstrate an oscillatory ... More
On utmost multiplicity of hierarchical stellar systemsJan 04 2017According to theoretical considerations, multiplicity of hierarchical stellar systems can reach, depending on masses and orbital parameters, several hundred, while observational data confirm existence of at most septuple (seven-component) systems. In ... More
Triple approach to determination of the c-axis penetration depth in BSCCO crystalsJun 23 2000The c-axis penetration depth $\lambda_c$ in Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ (BSCCO) single crystals as a function of temperature has been determined using three high-frequency techniques, namely: (i) measurements of the ac-susceptibility at a frequency ... More
c-axis penetration depth in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ single crystals measured by ac-susceptibility and cavity perturbation techniqueJun 23 2000The $c$-axis penetration depth $\Delta\lambda_c$ in Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ (BSCCO) single crystals as a function of temperature has been determined using two techniques, namely, measurements of the ac-susceptibility at a frequency of 100 kHz ... More
Microwave Surface Resistance in MgB2Mar 28 2001Mar 30 2001Measurements of the temperature dependence of the surface resistance at 3 GHz of 100 micron size grains of MgB_2 separated powder are presented and discussed. The microwave surface resistance data is compared to experimental results of Nb, Bi_2Sr_2CaCu_2O_{8+\delta} ... More
Effect of high-k environment on charge carrier mobility in grapheneSep 06 2008May 08 2009It is widely assumed that the dominant source of scattering in graphene is charged impurities in a substrate. We have tested this conjecture by studying graphene placed on various substrates and in high-k media. Unexpectedly, we have found no significant ... More
Time-resolved and continuous-wave optical spin pumping of semiconductor quantum wellsJul 23 2008Experimental and theoretical studies of all-optical spin pump and probe of resident electrons in CdTe/(Cd,Mg)Te semiconductor quantum wells are reported. A two-color Hanle-MOKE technique (based on continuous-wave excitation) and time-resolved Kerr rotation ... More
Spin coherence of a two-dimensional electron gas induced by resonant excitation of trions and excitons in CdTe/(Cd,Mg)Te quantum wellsJul 29 2007The mechanisms for generation of long-lived spin coherence in a two-dimensional electron gas (2DEG) have been studied experimentally by means of a picosecond pump-probe Kerr rotation technique. CdTe/(Cd,Mg)Te quantum wells with a diluted 2DEG were investigated. ... More
Hybridized magnetic microwire metacomposites towards microwave cloaking and barcoding applicationsJun 25 2015The microwave behavior of polymer metacomposites containing parallel Fe-based and continuous/short-cut Co-based microwire arrays has been investigated. A magnetic field-tunable metacomposite feature has been identified in the dense continuous hybrid composite ... More
Inhomogeneous nuclear spin polarization induced by helicity-modulated optical excitation of fluorine-bound electron spins in ZnSeAug 21 2015Optically-induced nuclear spin polarization in a fluorine-doped ZnSe epilayer is studied by time-resolved Kerr rotation using resonant excitation of donor-bound excitons. Excitation with helicity-modulated laser pulses results in a transverse nuclear ... More
Influence of metal contacts and charge inhomogeneity on transport properties of graphene near the neutrality pointNov 10 2008Jun 20 2009There is an increasing amount of literature concerning electronic properties of graphene close to the neutrality point. Many experiments continue using the two-probe geometry or invasive contacts or do not control samples' macroscopic homogeneity. We ... More
Statistical Reconstruction of QutritsDec 05 2003Apr 23 2004We discuss a procedure of measurement followed by the reproduction of the quantum state of a three-level optical system - a frequency- and spatially degenerate two-photon field. The method of statistical estimation of the quantum state based on solving ... More
High-Yield Production and Transfer of Graphene Flakes Obtained by Anodic BondingSep 15 2011We report large-yield production of graphene flakes on glass by anodic bonding. Under optimum conditions, we counted several tens of flakes with lateral size around 20-30 {\mu}m and few tens of flakes with larger size. 60-70% of the flakes have negligible ... More
Optical control of electron spin coherence in CdTe/(Cd,Mg)Te quantum wellsDec 14 2009Optical control of the spin coherence of quantum well electrons by short laser pulses with circular or linear polarization is studied experimentally and theoretically. For that purpose the coherent electron spin dynamics in a n-doped CdTe/(Cd,Mg)Te quantum ... More
Optical orientation of hole magnetic polarons in (Cd,Mn)Te/(Cd,Mn,Mg)Te quantum wellsMay 11 2016The optically induced spin polarization in (Cd,Mn)Te/(Cd,Mn,Mg)Te diluted-magnetic-semiconductor quantum wells is investigated by means of picosecond pump-probe Kerr rotation. At 1.8 K temperature, additionally to the oscillatory signals from photoexcited ... More
Development of High Granulated Straw Chambers of Large SizesJan 11 2007We have developed the baseline design for the straw drift tube tracking detectors for high rate environment application. The low-mass inner straw elements and the technology of the multianode straws assembly was devised and checked. The prototype chamber ... More
The LYRA Instrument Onboard PROBA2: Description and In-Flight PerformanceFeb 26 2013The Large Yield Radiometer (LYRA) is an XUV-EUV-MUV (soft X-ray to mid-ultraviolet) solar radiometer onboard the European Space Agency PROBA2 mission that was launched in November 2009. LYRA acquires solar irradiance measurements at a high cadence (nominally ... More
Gas electron multiplier: performance and possibilitiesOct 05 1998The gas electron multiplier produced with the polyimide film 100 um thick. The maximum gas gain obtained with gas mixture Ar/CH4(91/9) was 5000. No decrease of gas gain with rates up to 2\cdot10^4 1/(mm^2 s) was observed. The possibility of operation ... More
Linking two consecutive nonmerging magnetic clouds with their solar sourcesDec 21 2012On 15 May 2005, a huge interplanetary coronal mass ejection (ICME) was observed near Earth. It triggered one of the most intense geomagnetic storms of solar cycle 23 (Dst peak = -263 nT). This structure has been associated with the two-ribbon flare, filament ... More
Terahertz superlattice parametric oscillatorFeb 11 2005We report a GaAs/AlAs superlattice parametric oscillator. It was pumped by a microwave field (power few mW) and produced 3rd harmonic radiation (frequency near 300 GHz). The nonlinearity of the active superlattice was due to Bragg reflections of conduction ... More
Large anisotropy of electron and hole g factors in infrared-emitting InAs/InAlGaAs self-assembled quantum dotsDec 11 2015Mar 12 2016A detailed study of the $g$-factor anisotropy of electrons and holes in InAs/In$_{0.53}$Al$_{0.24}$Ga$_{0.23}$As self-assembled quantum dots emitting in the telecom spectral range of $1.5-1.6$ $\mu$m (around 0.8 eV photon energy) is performed by time-resolved ... More
Study of a Prominence Eruption using PROBA2/SWAP and STEREO/EUVI DataMar 30 2012May 16 2012Observations of the early rise and propagation phases of solar eruptive prominences can provide clues about the forces acting on them through the behavior of their acceleration with height. We have analyzed such an event, observed on 13 April 2010 by ... More
On detection of narrow angle e+e- pairs from dark photon decaysMar 19 2015A class of models of dark sectors consider new very weak interaction between the ordinary and dark matter transmitted by U'(1) gauge bosons A' (dark photons) mixing with our photons. If such A's exist, they could be searched for in a light-shining-through-a-wall ... More
Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dotsMar 03 2006Electron spin coherence has been generated optically in n-type modulation doped (In,Ga)As/GaAs quantum dots (QDs) which contain on average a single electron per dot. The coherence arises from resonant excitation of the QDs by circularly-polarized laser ... More
All-optical NMR in semiconductors provided by resonant cooling of nuclear spins interacting with electrons in the resonant spin amplification regimeMar 13 2014Resonant cooling of different nuclear isotopes manifested in optically-induced nuclear magnetic resonances (NMR) is observed in n-doped CdTe/(Cd,Mg)Te and ZnSe/(Zn,Mg)Se quantum wells and for donor-bound electrons in ZnSe:F and GaAs epilayers. By time-resolved ... More
Collisions of three-dimensional bipolar optical solitons in an array of carbon nanotubesOct 26 2016Nov 15 2016We study interactions of extremely short three-dimensional bipolar electromagnetic pulses propagating towards each other in an array of semiconductor carbon nanotubes, along any direction perpendicular to their axes. The analysis provides a full account ... More
Dirac cones reshaped by interaction effects in suspended grapheneApr 07 2011Sep 03 2011We report measurements of the cyclotron mass in graphene for carrier concentrations n varying over three orders of magnitude. In contrast to the single-particle picture, the real spectrum of graphene is profoundly nonlinear so that the Fermi velocity ... More
Temperature dependence of the microwave surface impedance measured on different kinds of MgB$_2$ samplesJul 11 2001Jul 15 2001In this paper we present the results of measurements of the microwave surface impedance of a powder sample and two films of MgB$_2$. One film has $T_c=30$ K and is not textured, the other is partially c-axis orientated with $T_c=38$ K. These samples show ... More
Mode selection in InAs quantum dot microdisk lasers using focused ion beam techniqueJul 29 2015Optically pumped InAs quantum dot microdisk lasers with grooves etched on their surface by a focused ion beam is studied. It is shown that the radial grooves, depending on their length, suppress the lasing of specific radial modes of the microdisk. Total ... More
Collisions of three-dimensional bipolar optical solitons in an array of carbon nanotubesOct 26 2016We study interactions of extremely short three-dimensional bipolar electromagnetic pulses propagating towards each other in an array of semiconductor carbon nanotubes, along any direction perpendicular to their axes. The analysis provides a full account ... More
Propagation of three-dimensional bipolar ultrashort electromagnetic pulses in an inhomogeneous array of carbon nanotubesApr 05 2018We study the propagation of three-dimensional (3D) bipolar ultrashort electromagnetic pulses in an inhomogeneous array of semiconductor carbon nanotubes. The heterogeneity is represented by a planar region with an increased concentration of conduction ... More
The "Horizon-T" Experiment: Extensive Air Showers DetectionMay 17 2016Oct 17 2016Horizon-T is an innovative detector system constructed to study Extensive Air Showers (EAS) in the energy range above 10^16 eV coming from a wide range of zenith angles (0 - 85 degrees). The system is located at Tien Shan high-altitude Science Station ... More
The "Horizon-T" Experiment: Extensive Air Showers DetectionMay 17 2016Nov 16 2016Horizon-T is an innovative detector system constructed to study Extensive Air Showers (EAS) in the energy range above 10^16 eV coming from a wide range of zenith angles (0 - 85 degrees). The system is located at Tien Shan high-altitude Science Station ... More
Tunable metal-insulator transition in double-layer graphene heterostructuresJul 01 2011Dec 12 2011We report a double-layer electronic system made of two closely-spaced but electrically isolated graphene monolayers sandwiched in boron nitride. For large carrier densities in one of the layers, the adjacent layer no longer exhibits a minimum metallic ... More
Anisotropy of Magnetization Reversal and Magnetoresistance in Square Arrays of Permalloy Nano-RingsApr 05 2006Magnetization reversal mechanisms and impact of magnetization direction are studied in square arrays of interconnected circular permalloy nanorings using MOKE, local imaging, numerical simulations and transport techniques.
3D visualizations of nano-scale phase separation and ultrafast dynamic correlation between phases in (Na0.32K0.68)0.95Fe1.75Se2Mar 14 2019Phase separation of metallic and antiferromagnetic (AFM) insulating phases in alkaline iron selenides (AxFe2-ySe2) continues to attract intense interest because the relationship between two peculiar features probably is a key to clarifying the pairing ... More
Two-band BCS superconductivity in Ba(Fe0.9Co0.1)2As2Aug 20 2010Sep 01 2010The conductivity and permittivity optical spectra of iron-pnictide Ba(Fe0.9Co0.1)2As2 film (Tc=20 K) are analyzed. In the superconducting state, at all temperatures up to Tc the temperature dependences of the magnetic field penetration depth and of the ... More