Now showing items 21-34 of 34

    • Quantum transport through one-dimensional aluminum wires 

      Batra, I. P.; Sen, P.; Çıracı, Salim (American Vacuum Society, 2002)
      Quantum conductance in narrow channels has been well understood by using the two-dimensional electron gas, a model system which has been realized in semiconductor heterojunctions. An essential property of this electron ...
    • Radiative donor-acceptor pair recombination in TlInS2 single crystals 

      Aydınlı, A.; Gasanly, N. M.; Yılmaz, I.; Serpengüzel, A. (Institute of Physics Publishing, 1999)
      Photoluminescence (PL) spectra of TlInS2 layered single crystals were investigated in the 500-860 nm wavelength region and in the 11.5-100 K temperature range. We observed two PL bands centred at 515 nm (2.41 eV, A band) ...
    • Raman enhancement on a broadband meta-surface 

      Ayas S.; Güner, H.; Türker, B.; Ekiz, O. O.; Dirisaglik, F.; Okyay, A., K.; Dâna, A. (American Chemical Society, 2012-07-30)
      Plasmonic metamaterials allow confinement of light to deep subwavelength dimensions, while allowing for the tailoring of dispersion and electromagnetic mode density to enhance specific photonic properties. Optical resonances ...
    • Reflection properties and defect formation in photonic crystals 

      Özbay, Ekmel; Temelkuran, B. (A I P Publishing LLC, 1996-08-05)
      We have investigated the surface reflection properties of a layer-by-layer photonic crystal. By using a Fabry-Perot resonant cavity analogy along with the reflection-phase information of the photonic crystal, we predicted ...
    • SbSI based photonic crystal superlattices: band structure and optics 

      Şimsek, Ş.; Koç, H.; Palaz, S.; Oltulu, O.; Mamedov, Amirullah M.; Özbay, Ekmel (IOP, 2015)
      In this work, we present an investigation of the optical properties and band structure calculations for the photonic crystal structures (PCs) based on one-dimensional (1D)-photonic crystal. Here we use 1D SbSI based layers ...
    • Spectral scalability and optical spectra of fractal multilayer structures: FDTD analysis 

      Şimsek, Şevket; Palaz, Selami; Mamedov, Amirullah M.; Özbay, Ekmel (Springer Verlag, 2017)
      An investigation of the optical properties and band structures for the conventional and Fibonacci photonic crystals (PCs) based on SrTiO3 and Sb2Te3 is made in the present research. Here, we use one-dimensional SrTiO3- and ...
    • Strained band edge characteristics from hybrid density functional theory and empirical pseudopotentials: GaAs, GaSb, InAs and InSb 

      Çakan, A.; Sevik, C.; Bulutay, C. (Institute of Physics Publishing Ltd., 2016)
      The properties of a semiconductor are drastically modified when the crystal point group symmetry is broken under an arbitrary strain. We investigate the family of semiconductors consisting of GaAs, GaSb, InAs and InSb, ...
    • Strong enhancement of spontaneous emission in amorphous-silicon-nitride photonic crystal based coupled-microcavity structures 

      Bayindir, M.; Tanriseven, S.; Aydinli, A.; Özbay, Ekmel (Wiley, 2001)
      We investigated photoluminescence (PL) from one-dimensional photonic band gap structures. The photonic crystals, a Fabry-Perot (FP) resonator and a coupled-microcavity (CMC) structure, were fabricated by using alternating ...
    • Theoretical assessment of electronic transport in InN 

      Bulutay, C.; Ridley, B. K. (Elsevier, 2004)
      Among the group-III nitrides, InN displays markedly unusual electronic transport characteristics due to its smaller effective mass, high peak velocity and high background electron concentration. First, a non-local empirical ...
    • The tight-binding approach to the corundum-structure d compounds 

      Ivanov, V. A. (Institute of Physics Publishing Ltd., 1994)
      The analysis of electronic structures has been carried out for the transition-metal compounds showing the corundum-type crystal symmetry using the suggested tight-binding method for interacting bands. With the self-consistent ...
    • Topological insulation in a ladder model with particle-hole and reflection symmetries 

      Hetényi, B.; Yahyavi, M. (Institute of Physics Publishing, 2018)
      A two-legged ladder model, one dimensional, exhibiting the parity anomaly is constructed. The model belongs to the C and CI symmetry classes, depending on the parameters, but, due to reflection, it exhibits topological ...
    • Topological Insulators: Electronic Band Structure and Spectroscopy 

      Palaz S.; Koc, H.; Mamedov, Aamirullah M.; Özbay, Ekmel (Institute of Physics Publishing, 2017)
      In this study, we present the results of our ab initio calculation of the elastic constants, density of states, charge density, and Born effective charge tensors for ferroelectric (rhombohedral) and paraelectric phases ...
    • Two-dimensional ferroelectric photonic crystals: Optics and band structure 

      Simsek S.; Mamedov, A. M.; Özbay, Ekmel (Taylor & Francis Inc., 2013-09-20)
      In this report we present an investigation of the optical properties and band structure calculations for the photonic structures based on the functional materials- ferroelectrics. A theoretical approach to the optical ...
    • Wave propagation and acoustic band gaps of two-dimensional liquid crystal/solid phononic crystals 

      Oltulu, O.; Mamedov, A. M.; Özbay, Ekmel (Springer Verlag, 2017)
      The vast majority of acoustic wave propagation in phononic band studies has been usually carried out by scattering inclusions embedded in a viscoelastic medium, such as air or water. In this study, we present calculated ...