Ahmed S. Jbara

Ahmed S. Jbara
Al Muthanna University · Mathematics Department, College of Education for Pure Science

Doctor of Philosophy (Physics) - Universiti Teknologi Malaysia
Asst Prof.

About

19
Publications
12,691
Reads
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127
Citations
Introduction
Our research interested now is a theoretical simulation of electronic and optical properties of semiconductor material. Density functional theory is the method used in this work.
Additional affiliations
February 2013 - February 2017
Universiti Teknologi Malaysia
Position
  • PhD Student
October 2006 - present
Al Muthanna University
Position
  • Researcher
Education
February 2013 - April 2017
Universiti Teknologi Malaysia
Field of study
  • Physics, Nanotechnology
October 2008 - October 2010
University of Babylon
Field of study
  • Theoretical Physics, Nanoscale
October 2001 - October 2005
Al Muthanna University
Field of study
  • Physics

Publications

Publications (19)
Article
The effect of constituent atoms on the physical properties of the MAX phase compounds M2AC and M2AB (M = Nb or Mo and A = Al or Ga) was studied theoretically. The obtained results showed that each MAX atom affects structural properties such as the equilibrium lattice constants, cohesive energy, and bulk modulus. Also, the thermodynamic stability wa...
Article
Methods capable of tuning the properties of van der Waals (vdW) layered materials in a controlled and reversible manner are highly desirable. Interfacial electronic properties of two-dimensional vdW heterostructure consisting of silicene and indium selenide (InSe) have been calculated using density functional theory-based computational code. Furthe...
Preprint
Electronic structure, optical and transport properties of double perovskite BaMgLaBiO 6 have been investigated theoretically with density functional theory (DFT) implemented in WIEN2k code. The structure is optimized to achieve the minimum energy at the ground state and the optimized lattice parameters. The calculated formation energy shows the sta...
Article
Magnetic materials with high spin polarization emerge as a potential candidate in spintronic applications. The present work reports the theoretical investigation of spin-polarized electronic, structural, magnetic, and optical properties of full-Heusler Co2VZ (Z = Al, Be) alloys calculated with full-potential linearized augmented plane wave method i...
Article
Electronic structure, optical and transport properties of Zintl phase BaMg2P2 compound are investigated theoretically using density functional theory as implemented in WIEN2k code. Comprehensive study on the aforementioned properties is carried out using local density (LDA) and generalized gradient approximations (GGA) along with the recently devel...
Article
The effect of pressure (up to 10 GPa) on the electronic and optical properties of bromine-substituted cesium lead iodide (CsPbI3), as one promising inorganic halide perovskite, is investigated using modified Backe-Johnson (mBJ) potential for the first time to our knowledge. The lattice parameters, electronic bandgap, and imaginary and real parts of...
Article
Electronic, magnetic, dynamic, elastic, thermodynamic, and thermoelectric properties for Co2-based full Heusler alloys are investigated theoretically. The full potential–linearized augmented plane wave (FP-LAPW) method within density functional theory (DFT) incorporated on WIEN2k code is employed in our calculation. Through this study, we found tha...
Article
The narrow bandgap PbSe has attracted a remarkable interest from the researchers in recent years for their potential optoelectronics and photovoltaic applications. In this article, we report the optoelectronic properties of cubic (NaCl-type) and orthorhombic (Cmcm- and Pnma-type) polymorphs of PbSe using the density functional theory based first-pr...
Article
This paper reports on the influence of the bromine (Br) atoms substitution on the structures and optoelectronic traits of ${\text{CsPbI}_3}$CsPbI3, wherein the density functional theory (DFT) simulation was performed, using all electrons full potential linearized augmented plane-wave method. Furthermore, the generalized gradient approximation, loca...
Article
The computational approach based on full-potential linearized augmented plane wave (FP-LAPW) is used to study BeS1-xSex compound (with x = 0, 0.25, 0.50, 0.75, and 1). Modified Becke–Johnson (mBJ) along with generalized gradient approximation (GGA) is used for modeling exchange-correlation effects to improve the band structure calculations. The str...
Article
The electronic and optical parameters of two alumina phases γ- and -Al2O3 have been studied by first principles within the framework of density function theory. The computational approach is based on full-potential linearized augmented plane wave method (FP-LAPW) within the generalized gradient approximation (GGA), and modified Becke–Johnson poten...
Article
Full-text available
Single-phase θ-Al2O3 nanopowder has been synthesized by co-precipitation technique. The synthesized powders were sintered at a temperature ranging from 900 to 1200 °C. A stable monoclinic phase is observed for the whole sintering temperature range. The purity, chemical bonds, morphology and optical properties of the powders were investigated by dif...
Article
Full-text available
The electronic and optical parameters of γ-Al2O3 and θ-Al2O3 have been studied by using the first principle within the framework of density function theory (DFT). The computational approach is based on full-potential linearized augmented plane wave method (FP-LAPW) within the generalized gradient approximation (GGA), local density approximation (LD...
Article
Full-text available
Co-precipitation technique has been used to synthesize gamma-Al2O3 (γ-Al2O3) nanopowders under annealing temperature effect. The crystalline phase and purity for the prepared powder were characterized by different spectroscopy techniques. XRD analysis confirms the gamma phase of alumina nanopowders with particle diameter ranging from 6 to 24 nm, wh...
Article
Cu-Al substituted Co ferrite nanopowders, Co1-xCuxFe2-xAlxO4 (0.0 ≤x≤ 0.8) were synthesized by co-precipitation method. The effect of Cu-Al substitution on the structural and magnetic properties have been investigated. X-ray diffraction (XRD) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (...
Conference Paper
Full-text available
The electronic and optical parameters of γ-and θ-Al 2 O 3 have been studied by first principles. The results show that these materials have a direct band gap, and are in good agreement with the previous experimental values. The absorption coefficient of this material is also investigated, and the results advocate using this material as a transparen...
Article
Full-text available
Based on the Schrödinger equation for envelope function in the effective mass approximation, linear and nonlinear optical absorption coefficients in a multi-subband lens quantum dot are investigated. The effects of quantum dot size on the interband and intraband transitions energy are also analyzed. The finite element method is used to calculate th...
Article
Full-text available
Four wave mixing analysis is stated for quantum dot semiconductor optical amplifiers (QD SOAs) using the propagation equations (including nonlinear propagation contribution) coupled with the QD rate equations under the saturation assumption. Long wavelength III-nitride InN and AIInN QD SOAs are simulated. Asymmetric behavior due to linewidth enhanc...
Article
Full-text available
In this work, we calculate material gain for long wavelength III-nitride InN and AlInN quantum dot (QD) structures. Strain and QD inhomogeneity are included in the calculations. The study covers (800-2300 nm) wavelength range which is important in optical communications. While p-doping is shown to be efficient to increasing gain, changing QD size (...

Questions

Questions (3)
Question
I want to check this series true or false (attached below), I am sure it is wrong, but it found in more books
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Projects

Projects (2)
Project
Increasing utilization of energy for human activity that is needed to very attention, as well as, energy sources can be terminated through time, except the energy coming from the sun, also solar energy is clean and plentiful. The main objective of this work is creating a simulation model, which can be finally tested with experimental results or other programs. The continuity equations for electrons and holes will be used to describe the physical behaviour of the solar cell, and then Poisson’s equation commonly applied for semiconductor device simulation. All the steps involved in this simulation may be written as MATLAB code.
Project
Goal: Magnetic spinel ferrites are important materials owing to their excellent electrical and magnetic properties, viz. low dielectric constant, low dielectric losses, high resistivity, low coercivity and low saturation magnetization [1, 2]. Their distinctive qualities such as high electrical resistivity, high permeability and negligible eddy current losses for high-frequency electromagnetic wave propagation make them suitable for many technological applications such as high-density magnetic storage, microwave and telecommunication devices, magnetic fluids, drug delivery and gas sensors. Bulk cobalt ferrites have inverse spinel cubic structure [3]. Crystal structure is face-centred-cubic in which unit cell containing 32 O2−, 8 Co2+ and 16 Fe3+ ions. The oxygen ions form 64 tetrahedral (A) and 32 octahedral (B) sites, where 24 cations are placed. In inverse spinel cobalt ferrite nanoparticles, the A site is fully occupied by Fe3+ ions and the B site is occupied by Co2+ and Fe3+ ions. Hence, the ferrimagnetism in these materials is a result of anti-parallel spins between Fe3+ and Co2+ at A and B sites, respectively. In-depth exploration of earlier studies, we found there are many parameters of these compounds are missing from simulation side and more accurate results are needed for their values. Therefore, the project proposed herein focused on studying the structural, electronic, thermal, and magnetic parameters for cobalt ferrite compounds doped with Cu, Al, Ni, Zn, and Mg elements by density functional theory, which complements our previously experimental results group [4-9] References 1. A. Hassan, M. A. Khan, M. Shahid, M. Asghar, I. Shakir, S. Naseem, S. Riaz, and M. F. Warsi, Journal of Magnetism and Magnetic Materials 393 (2015) 56-61 2. G. Mustafa, M. Islam, W. Zhang, A. W. Anwar, Y. Jamil, G. Murtaza, I. Ali, M. Hussain, A. Ali, and M. Ahmad, Journal of Magnetism and Magnetic Materials 387 (2015) 147-154 3. R. W. Wyckoff, The structure of crystals, ed. 2nd. 1930. 4. A. A. Ati, Z. Othaman, and A. Samavati, Journal of Molecular Structure 1052 (2013) 177-182 5. A. A. Ati, Z. Othaman, A. Samavati, and F. Y. Doust, Journal of Molecular Structure 1058 (2014) 136-141 6. S. Dabagh, A. A. Ati, R. Rosnan, S. Zare, and Z. Othaman, Materials Science in Semiconductor Processing 33 (2015) 1-8 7. S. Zare, A. A. Ati, S. Dabagh, R. Rosnan, and Z. Othaman, Journal of Molecular Structure 1089 (2015) 25-31 8. S. Dabagh, A. A. Ati, S. Ghoshal, S. Zare, R. Rosnan, A. S. Jbara, and Z. Othaman, Bulletin of Materials Science 39 (2016) 1029-1037 9. R. Rosnan, Z. Othaman, R. Hussin, A. A. Ati, A. Samavati, S. Dabagh, and S. Zare, Chinese Physics B 25 (2016) 047501