Photo of Oleksandr Kotlyar
    • School of Engineering and Applied Science, Aston University

      B4 7ET Birmingham

      United Kingdom

    20062019
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    Research Output 2006 2019

    2019
    Open Access
    File
    telecommunication
    fiber optics
    communication
    optics

    Artificial neural network-based equaliser in the nonlinear fourier domain for fibre-optic communication applications

    Kamalian-Kopae, M., Vasylchenkova, A., Kotlyar, O., Pankratova, M., Prilepsky, J. & Turitsyn, S., 17 Oct 2019, 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019. IEEE, 8871832

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Equalizers
    Fiber optics
    fiber optics
    Fourier transforms
    communication
    Open Access
    File
    Optical communication
    Support vector machines
    Learning systems
    Fourier transforms
    Communication systems

    The phenomenon of conversion polymorphism in Bi-containing metastable perovskites

    Khalyavin, D. D., Salak, A. N., Fertman, E. L., Kotlyar, O. V., Eardley, E., Olekhnovich, N. M., Pushkarev, A. V., Radyush, Y. V., Fedorchenko, A. V., Desnenko, V. A., Manuel, P., Ding, L., Čižmár, E. & Feher, A., 16 Apr 2019, In : Chemical Communications. 55, 32, p. 4683-4686 4 p.

    Research output: Contribution to journalArticle

    Polymorphism
    Hot Temperature
    Pressure
    Metastable phases
    Perovskite

    Unsupervised and supervised machine learning for performance improvement of NFT optical transmission

    Kotlyar, O., Pankratova, M., Kamalian Kopae, M., Vasylchenkova, A., Prilepsky, J. E. & Turitsyn, S. K., 4 Mar 2019, 2018 British and Irish Conference on Optics and Photonics, BICOP 2018 - Proceedings. IEEE, 8658274

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Open Access
    File
    machine learning
    Light transmission
    Support vector machines
    Learning systems
    quadrature amplitude modulation
    2017

    Magnetic properties of the Bi 0.65 La 0.35 Fe 0.5 Sc 0.5 O 3 perovskite

    Fedorchenko, A. V., Fertman, E. L., Desnenko, V. A., Kotlyar, O. V., Čižmár, E., Shvartsman, V. V., Lupascu, D. C., Salamon, S., Wende, H., Salak, A. N., Khalyavin, D. D., Olekhnovich, N. M., Pushkarev, A. V., Radyush, Y. V. & Feher, A., 1 Apr 2017, In : Acta Physica Polonica A. 131, 4, p. 1069-1071 3 p.

    Research output: Contribution to journalArticle

    magnetic properties
    magnetic moments
    magnetic fields
    anomalies
    magnetization

    Multiferroic Bi 0.65 La 0.35 Fe 0.5 Sc 0.5 O 3 perovskite: Magnetic and thermodynamic properties

    Fertman, E. L., Fedorchenko, A. V., Khalyavin, D. D., Salak, A. N., Baran, A., Desnenko, V. A., Kotlyar, O. V., Čižmár, E., Feher, A., Syrkin, E. S., Vaisburd, A. I., Olekhnovich, N. M., Pushkarev, A. V., Radyush, Y. V., Stanulis, A. & Kareiva, A., 1 May 2017, In : Journal of Magnetism and Magnetic Materials. 429, p. 177-181 5 p.

    Research output: Contribution to journalArticle

    Open Access
    File
    Perovskite
    Magnetic properties
    Thermodynamic properties
    thermodynamic properties
    magnetic properties
    2016

    Electronic structure and magnetic properties of fete, bifeo3, srfe12o19 and srcotife10o19 compounds

    Lyogenkaya, A. A., Grechnev, G. E., Kotlyar, O. V., Panfilov, A. S. & Gnezdilov, V. P., 1 Jan 2016, In : Ukrainian Journal of Physics. 61, 6, p. 523-530 8 p.

    Research output: Contribution to journalArticle

    File
    density functional theory
    electronic structure
    magnetic properties
    iron
    gradients

    Electronic structure and magnetic properties of RT4Al8 (R = Sc, Y, La, Lu; T = Fe, Mn, Cr) compounds. Hydrostatic pressure effects

    Zhuravleva, I. P., Grechnev, G. E., Panfilov, A. S., Lyogenkaya, A. A., Kotlyar, O. V., Fedorchenko, A. V. & Feher, A., 7 Jul 2016, In : Low Temperature Physics. 42, 6, p. 458-465 8 p.

    Research output: Contribution to journalArticle

    Open Access
    File
    pressure effects
    hydrostatic pressure
    magnetic moments
    electronic structure
    magnetic properties

    Errata to "Features of the electron structure of FeTe compounds" [Low Temp. Phys., 41, (2015), 990]

    Grechnev, G. E., Lyogenkaya, A. A., Panfilov, A. S., Logosha, A. V., Kotlyar, O. V., Gnezdilov, V. P., Makarova, I. P., Chareev, D. A. & Mitrofanova, E. S., 1 Feb 2016, In : Low Temperature Physics. 42, 2, 1 p.

    Research output: Contribution to journalComment/debate

    2015

    Exchange bias phenomenon in (Nd1-xYx)2/3Ca1/3MnO3 (x = 0, 0.1) perovskites

    Fertman, E. L., Fedorchenko, A. V., Kotlyar, A. V., Desnenko, V. A., Čižmár, E., Baran, A., Khalyavin, D. D., Salak, A. N., Shvartsman, V. V. & Feher, A., 31 Dec 2015, In : Low Temperature Physics. 41, 12, p. 1001-1005 5 p.

    Research output: Contribution to journalArticle

    Open Access
    File
    perovskites
    coercivity
    magnetization
    yttrium
    magnetic fields

    Features of the electron structure of FeTe compounds

    Grechnev, G. E., Lyogenkaya, A. A., Panfilov, A. S., Logosha, A. V., Kotlyar, O. V., Gnezdilov, V. P., Makarova, I. P., Chareev, D. A. & Mitrofanova, E. S., 31 Dec 2015, In : Low Temperature Physics. 41, 12, p. 990-995 6 p.

    Research output: Contribution to journalArticle

    Open Access
    File
    Fermi surfaces
    chemical bonds
    electrons
    covalent bonds
    neutron diffraction
    2014

    Low-frequency properties of the phonon spectra, and low-temperature thermodynamics of disordered solid solutions

    Gospodarev, I. A., Grishayev, V. I., Eremenko, A. V., Klochko, M. S., Kotlyar, A. V., Manzheliy, E. V., Syrkin, E. S. & Feodosyev, S. B., 1 Nov 2014, In : Low Temperature Physics. 40, 11, 1013.

    Research output: Contribution to journalArticle

    Open Access
    File
    solid solutions
    low frequencies
    vibration
    thermodynamics
    bosons
    2013

    Impurity levels in the electronic spectra of graphene

    Feher, A., Feodosyev, S., Gospodarev, I., Kotlyar, O., Kravchenko, K., Manzhelii, E. & Syrkin, E., 1 Jan 2013, In : Superlattices and Microstructures. 53, 1, p. 55-62 8 p.

    Research output: Contribution to journalArticle

    Graphite
    electronic spectra
    Graphene
    graphene
    Impurities
    2008

    Local vibrational states in real crystals with impurities near the surface

    Feodosyev, S., Gospodarev, I., Kotlyar, O. & Manzhelii, E., 4 Jun 2008, In : Journal of Physics Condensed Matter. 20, 22, 224025.

    Research output: Contribution to journalArticle

    Defect structures
    vibrational states
    Impurities
    impurities
    Defects

    Local vibrations in real crystals with combined defects

    Gospodarev, I. A., Kotlyar, A. V., Manzhelii, E. V. & Fedosyev, S. B., 13 Mar 2008, In : Low Temperature Physics. 34, 2, p. 152-160 9 p.

    Research output: Contribution to journalArticle

    Open Access
    File
    vibration
    defects
    crystals
    impurities
    approximation

    Loffe-Regel' crossover and boson peaks in disordered solid solutions and similar anomalies in heterogeneous crystalline structures

    Gospodarev, I. A., Grishaev, V. I., Kotlyar, A. V., Kravchenko, K. V., Manzheliǐ, E. V., Syrkin, E. S. & Feodos'Ev, S. B., 9 Oct 2008, In : Low Temperature Physics. 34, 8, p. 655-664 10 p.

    Research output: Contribution to journalArticle

    Open Access
    File
    crossovers
    solid solutions
    bosons
    anomalies
    excitation
    2007

    Evolution of discrete local levels into an impurity band in solidified inert gas solution

    Kosevich, A. M., Feodosyev, S. B., Gospodarev, I. A., Grishaev, V. I., Kotlyar, O. V., Kruglov, V. O., Manzhelii, E. V. & Syrkin, E. S., 3 Aug 2007, In : Low Temperature Physics. 33, 6, p. 559-563 5 p.

    Research output: Contribution to journalArticle

    Open Access
    File
    solidified gases
    rare gases
    impurities
    matrix methods
    atoms

    Specific features of the transformation of local levels into an impurity band of Ag 1-p Al p disordered solid solutions

    Kosevich, A. M., Gospodarev, I. A., Grishaev, V. I., Kotlyar, A. V., Kruglov, V. O., Manzheliĭ, E. V., Syrkin, E. S. & Feodosyev, S. B., 1 Jul 2007, In : Journal of Experimental and Theoretical Physics. 105, 1, p. 4-11 8 p.

    Research output: Contribution to journalArticle

    solid solutions
    aluminum
    Jacobi matrix method
    impurities
    atoms

    To the theory of rare gas alloys: Heat capacity

    Bagatskii, M. I., Feodosyev, S. B., Gospodarev, I. A., Kotlyar, O. V., Manzhelii, E. V., Nedzvetskiy, A. V. & Syrkin, E. S., 3 Aug 2007, In : Low Temperature Physics. 33, 6, p. 564-568 5 p.

    Research output: Contribution to journalArticle

    Open Access
    File
    rare gases
    specific heat
    impurities
    low frequencies
    temperature dependence
    2006

    Local vibrational modes in crystal lattices with a simply connected region of the quasi-continuous phonon spectrum

    Kotlyar, A. V. & Feodosyev, S. B., 7 Jul 2006, In : Low Temperature Physics. 32, 3, p. 256-269 14 p.

    Research output: Contribution to journalArticle

    Open Access
    File
    crystal lattices
    vibration mode
    Jacobi matrix method
    impurities
    Green's functions