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Introduction
Yakup Emül currently works at the Department of Software Engineering, Cumhuriyet University. Yakup does research in Atomic, Molecular and Optical Physics, Computational Physics and Optics. Their most recent publication is 'Analysis of paramagnetic 3d ions (Cr 3+ and Fe 3+ ) centers in fluoroelpasolite Cs 2 NaGaF 6 crystal by both DFT and SPM calculations'.
Current institution
Additional affiliations
September 2006 - December 2014
Education
February 2009 - August 2014
July 2004 - October 2008
September 1997 - June 2004
Publications
Publications (8)
This study employs the Mueller matrix method to analyse the optical properties of a two-stage liquid crystal (LC) retarder system. The system is constructed using planar-aligned nematic LC cell retarders and linear polarisers. The orientation of the LC molecules (LCMs) in the cells are determined through Monte Carlo (MC) simulations by using a latt...
A detailed microscopic study of the local geometry was performed for the cation sites in fluoroelpasolite Cs2NaYF6 crystal doped with 3d ions (Cr³⁺ and Fe³⁺). Electronic structure of pure, Cr-doped and Fe-doped Cs2NaYF6 has been studied by determining various properties: substitution energies of dopant ions, ionic Mulliken charges, atomic coordinat...
Allowing high transition metal (TM) ions doping concentrations makes the fluoroelpasolite crystals Cs2NaMF6 (M = Al, Ga) quite interesting in various laser applications. In this study, we explored the influence of the dopant ions on the electronic and structural properties of Cs2NaAlF6. Particular attention is paid to the influence of trivalent TM...
The structural properties of 3d ions (Cr³⁺ and Fe³⁺) centers in Cs2NaGaF6 have been investigated by performing density functional theory (DFT) and semi-empirical superposition model (SPM) calculations. The local geometry (i.e. equilibrium ligand distance and angles between the host cation ion (Cs⁺, Na⁺, or Ga³⁺) and F ligands) for pure, Cr³⁺ doped...
The Mueller Matrix (MM) elements of the planar liquid crystal cell which is illuminated with a broad band light source was investigated and six MM elements were experimentally measured as functions of wavelength in the range of 500--800 nm at different cell alignment angles. Analysis of the MM curves were used to explain how the state of the linear...
Analyses of the local crystal and electronic structure in the vicinity of Fe3+ centers in perovskite KMgF3 crystal have been carried out in a comprehensive manner. A combination of density functional theory
(DFT) and a semi-empirical superposition model (SPM) is used for a complete analysis of all Fe3+ centers in this study for the first time. Some...
The local structure around Cr3+ centers in perovskite KMgF3 crystal have been investigated through the applications of both an ab-initio, density functional theory (DFT), and a semi empirical, superposition model (SPM), analyses. A supercell approach is used for DFT calculations. All the tetragonal (Cr3+–VMg and Cr3+–Li+), trigonal (Cr3+–VK), and C...
Monte Carlo (MC) simulations and the Mueller matrix formalism were applied to investigate electro optical properties of a LC cell with planar boundary conditions for various thicknesses. Field dependent global order parameter and the optical transmissions were analyzed in common. Three characteristic regions of the periodicity of optical transmissi...
