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Physics: Recent submissions

  • Discrete Vortices in Photonic Graphene 
    Dybyspayeva, Kumiszhan (Nazarbayev University School of Science and Technology, 2017-04)
    Graphene is a relatively new 2D material consisting of carbon atoms in honeycomb structure. Because of this structure, it has various interesting properties such as linear dispersion relation in the low energy spectrum ...
  • Brillouin visco-elastometry and Raman spectroscopy of potassium permanganate aqueous solutions 
    Omarkulova, Aziza (Nazarbayev University School of Science and Technology, 2017-04)
    This thesis tries to find connection between mechanical and chemical properties of KMnO4 aqueous solutions with variable opacity. To the best of our knowledge, there was no research done on this or similar topic. The ...
  • Supernova distribution about the Galaxy Center 
    Nussupbekov, Ayan (Nazarbayev University School of Science and Technology, 2017-04)
    The discovery of the gravitational waves opened various possibilities in astrophysics. One of them is to use the supermassive black holes at the Galaxy center as focusing lenses for gravitational waves. Because of it, ...
  • Deploying Nonlinear Circuits on Wireless Power Transmitters and Receivers 
    Shaikhov, Aidyn (Nazarbayev University School of Science and Technology, 2017-04)
    In this thesis, several methods that increase the tolerance of a wireless power transfer system are illustrated. For that reason, a Duffing oscillator (the second order differential equation with a third order of ...
  • The correlation expansion method used in quantum computation 
    Baitenov, Adil (Nazarbayev University School of Science and Technology, 2017-04)
    In this master thesis, 3 methods of solving of Quantum Ising model have been outlined and compared, they include ABC. We investigate the entanglement dynamics and find energy and spin values for 1-dimensional Quantum ...
  • Highly selective transmission and absorption from metasurfaces of periodically corrugated cylindrical particles 
    Tagay, Zhenisbek; Valagiannopoulos, Constantinos (Physical review B, 2018-09-25)
    Gratings of infinite wires make, perhaps, the simplest class of metasurfaces, which, however, are utilized for a variety of different objectives in wave manipulation. Importantly, due to their analytical solvability, ...
  • Brillouin spectroscopy and radiography for assessment of viscoelastic and regenerative properties of mammalian bones 
    Akilbekova, Dana; Ogay, Vyacheslav; Yakupov, Talgat; Sarsenova, Madina; Umbayev, Bauyrzhan; Nurakhmetov, Asset; Tazhin, Kairat; Yakovlev, Vladislav V.; Utegulov, Zhandos N. (Journal of Biomedical Optics, 2018-09-27)
    Biomechanical properties of mammalian bones, such as strength, toughness, and plasticity, are essential for understanding how microscopic-scale mechanical features can link to macroscale bones’ strength and fracture ...
  • Band structure of cavity-type hypersonic phononic crystals fabricated by femtosecond laser-induced two-photon polymerization 
    Rakhymzhanov, A. M.; Gueddida, A.; Alonso-Redondo, E.; Utegulov, Zhandos; Perevoznik, D.; Kurselis, K.; Chichkov, B. N.; El Boudouti, E. H.; Djafari-Rouhani, B.; Fytas, G. (Applied Physics Letters, 2016-05)
    The phononic band diagram of a periodic square structure fabricated by femtosecond laser pulseinduced two photon polymerization is recorded by Brillouin light scattering (BLS) at hypersonic (GHz) frequencies and computed ...
  • Assessing performance of modern Brillouin spectrometers 
    Coker, Zachary; Troyanova‐Wood, Maria; Traverso, Andrew J.; Yakupov, Talgat; Utegulov, Zhandos; Yakovlev, Vladislav V. (Optics Express, 2018-02)
    Brillouin spectroscopy and imaging has experienced a renaissance in recent years seeing vast improvements in methodology and increasing number of applications. With this resurgence has come the development of new spontaneous ...
  • Size effects in near-ultraviolet Raman spectra of few-nanometer-thick silicon-oninsulator nanofilms 
    Poborchii, Vladimir; Morita, Yukinori; Tada, Tetsuya; Geshev, Pavel I.; Utegulov, Zhandos; Volkov, Alexey (Journal of Applied Physics, 2016-04)
    We have fabricated Si-on-insulator (SOI) layers with a thickness h1 of a few nanometers and examined them by Raman spectroscopy with 363.8 nm excitation. We have found that phonon and electron confinement play important ...
  • Laser thermoelastic generation in metals above the melt threshold 
    Every, A. G.; Utegulov, Zhandos; Veres, I. A. (Journal of Applied Physics, 2013-11)
    An approach is presented for calculating thermoelastic generation of ultrasound in a metal plate exposed to nanosecond pulsed laser heating, sufficient to cause melting but not ablation. Detailed consideration is given to ...
  • Nonlinear waves in hyperbolic metamaterials: focus on solitons and rogues 
    Boardman, A.D.; Grimalsky, V.V.; Guo, T.; Kibler, B.; McNiff, J.; Nefedov, I.; Rapoport, Y.; Argyropoulos, C.; Valagiannopoulos, Constantinos (Nazarbayev University School of Science and Technology, 2018-05-07)
    The investigation of hyperbolic metamaterials, shows that metal layers that are part of graphene structures, and also types I and II layered systems, are readily controlled. Since graphene is a nicely conducting sheet it ...
  • Analytical investigations of ground modifications assisting the detection of buried object 
    Valagiannopoulos, Constantinos; Tsitsas, Nikolaos L.; Sihvola, Ari H. (Nazarbayev University School of Science and Technology, 2016-08-18)
    A ground-penetrating radar (GPR) antenna excites a perfectly electric conducting inclusion buried inside the ground. The scattering problem is solved semi-analytically via integral equation techniques. The permittivity and ...
  • Photonic crystals for optimal color conversion in light-emitting diodes: a semi-analytical approach 
    Valagiannopoulos, Constantinos; Lagoudakis, Pavlos G. (Nazarbayev University School of Science and Technology, 2018-04-13)
    Based on effective-medium approximation, we analytically optimize the color conversion of GaN-based light-emitting p–n junctions, with respect to the size and spatial density of the used photonic crystals (PhCs), being ...
  • On Self-Oscillating Wireless Power Transfer 
    Tretyakov, Sergei; Ra’di, Younes; Simovski, Constantin; Valagiannopoulos, Constantinos (IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS), 2017-11-13)
    Abstract—Conventional wireless power transfer systems consist of a microwave power generator located at one place and a microwave power receiver located at a distance. To realize efficient power transfer, the system ...
  • Cooperative surmounting of bottlenecks 
    Hennig, D.; Mulhern, C.; Schimansky-Geier, L.; Tsironis, G.P.; Hänggi, P. (Physics Reports, 2015-07-20)
    Abstract The physics of activated escape of objects out of a metastable state plays a key role in diverse scientific areas involving chemical kinetics, diffusion and dislocation motion in solids, nucleation, electrical ...
  • Stochastic metastability by spontaneous localisation 
    Oikonomou, Th.; Nergis, A.; Lazarides, N.; Tsironis, G.P. (Chaos, Solitons & Fractals, 2014-12-01)
    Abstract Nonequilibrium, quasi-stationary states of a one-dimensional “hard” ϕ4 deterministic lattice, initially thermalised to a particular temperature, are investigated when brought into contact with a stochastic thermal ...
  • Lithium CPS based on carboxylic fabric with CNT synthesized on its fibers’ surface 
    Zaurbekova, Z.; Chikhray, Y.; Ponkratov, Y.; Baklanov, V.; Abdullin, K.; Kulsartov, T.; Gordienko, Y.; Tazhibayeva, I.; Skakov, M.; Mukanova, A. (Materials Today: Proceedings, 2017-01-01)
    Abstract The paper describes a technique of CNT synthesis on the fibers of carboxylic fabric. It consists of three operational stages: creation of the experimental facility based on high-temperature quartz flow reactor; ...
  • Self-induced transparency of the optical phonons 
    Mandilara, Aikaterini; Ivić, Zoran; Čevizović, Dalibor; Pržulj, Željko (Chaos, Solitons & Fractals, 2017-12-01)
    Abstract We show that the self-induced transparency of optical phonons may appear in a systems consisting of a two level atoms interacting with elastic waves. The presence of the gap in phonon spectrum substantially enhances ...
  • Effects of internal stresses and intermediate phases on the coarsening of coherent precipitates: A phase-field study 
    Asle Zaeem, M.; El Kadiri, H.; Horstemeyer, M.F.; Khafizov, M.; Utegulov, Z. (Current Applied Physics, 2012-03-01)
    Abstract Phase stability, topology and size evolution of precipitates are important factors in determining the mechanical properties of crystalline materials. In this article, the Cahn–Hilliard type of phase-field model ...