Conveners
Material Physics
- Esmeralda Yitamben (ASP)
- Dipti Sahu (NUST)
Material Physics
- Dipti Ranjan Sahu (NUST)
- Esmeralda Yitamben (ASP)
Material Physics
- Dipti Ranjan Sahu (NUST)
Since the discovery of graphene in 2004, many new 2 dimensional materials have been synthesised. These form ideal systems to model quantum mechanically and to modify computationally, for example by doping or the creation of various defects, with the view to alter the physical, electronic, magnetic, etc., properties. Within the framework of density functional theory, a number of 2D systems will...
We include effects of self-gravitation in the self-interaction of single electrons with the electromagnetic field. When the effect of gravitation is included there is an inevitable cut-off of the k-vector - the upper limit is finite. The inward pressure of the self-gravitating field balances the outward pressure of self-interaction. Both pressures are generated by self-interactions of the...
New materials have always added to new technology and subsequently new society. The simplest example can be going to history where we can see the transitions from Stone Age which developed into Bronze and then Iron Age. Each age is levelled by the material, bearing the new technology and new society. The present age is levelled by the Silicon material and is known as Silicon age. Now question...
This research seeks to understand the role of ScCl3, ZrCl4, and VCl3 catalysts in NaAlH4. Some researchers suggests that the catalyst serves to decrease the H2 gas desorption temperature in these materials by influencing the reaction rates. Others suggest that the catalyst acts more as a dopant, thereby mitigating (enhancing) diffusion rates is in the solid phases. Changes in the hydride...
Chalcogenide glasses containing S, Se or Te constitute a rich family of vitreous semiconductors. There has been intense research activity based on these glasses in the view of basic Physics as well as device technology. The freedom allowed in the preparation of glasses in varied composition brings about changes in their short-range order and thus results in variation of their physical...
1.Motivation
High energy multi-cycle (narrow band) terahertz pulses are necessary for linear electron acceleration [1]. Due to the low damage threshold of periodically poled Lithium Niobate (PPLN) crystals, high absorption of the material at the terahertz frequencies and low quantum efficiency, efficient generation of high energy terahertz beams is extremely challenging.
Here, we consider a...
Chalcogenide glasses containing S, Se or Te constitute a rich family of vitreous semiconductors. There has been intense research activity based on these glasses in the view of basic Physics as well as device technology. The freedom allowed in the preparation of glasses in varied composition brings about changes in their short-range order and thus results in variation of their physical...
The present talk focuses on the computed results of electronic band structure, electronic density of states, electronic charge density plots and Fermi surfaces of Fe-Ni invar materials namely L12 FeNi3, taenite L10 FeNi, L12 Fe3Ni, D03 Fe3Ni, Z1 Fe3Ni, D03 FeNi3 and tetrataenite L10 FeNi. The investigation carried out based on the density functional theory as implemented in Quantum Espresso. ...
1.Motivation
High energy multi-cycle (narrow band) terahertz pulses are necessary for linear electron acceleration [[1]][1]. Due to the low damage threshold of periodically poled Lithium Niobate (PPLN) crystals, high absorption of the material at the terahertz frequencies and low quantum efficiency, efficient generation of high energy terahertz beams is extremely challenging.
Here, we...
Chalcopyrite semiconductors are an important class of materials, which are having potential applications in new cutting-edge classes of electronic, photovoltaic and optoelectronic devices. The AIBIIIC2VI and AIIBIVC2V groups of semiconductors crystallize in the chalcopyrite structure, which is a superlattice of the zinc blende structure obtained by doubling its unit cube along the z-axis that...
Since the discovery of organic polymers in 1977,remarkable progress has been made in the development of organic electronics. However, OFET performances are limited by poor charge carriers mobility. Recent studies show several parameters that can influence the performance of the field effect mobility and then the electrical performance of electronics devices. In this study, we demonstrate the...
DIALLO Abdoul Kadri (1), DIALLO Abdou Karim (2), FALL Sadiara (3), KOBOR Diouma (1), PASQUINELLI Marcel (4), HEISER Thomas (3)
(1) Laboratoire de Chimie et de Physique des Matériaux (LCPM), Ziguinchor, Senegal
(2) University Gaston Berger, Department of Applied Physics, Saint Louis, Senegal
(3) Laboratoire ICube, DESSP, CNRS, Strasbourg, France,
(4) OPTO-PV Group/Institut Matériaux...
In this work, fully printed and flexible current switches are demonstrated, an approach of simulating and predicting their electrical response using electronics simulator is also proposed. Planar printed flexible transistor operating as current switches were produced on plain paper (80 g/m$^2$), using silver as electrodes and silicon as the active material. The active material and the devices...
MariX Project focuses on the development of a compact machine to produce beams of high brilliance mono-chromatic tunable X-rays with energy in the range from 30 to 150 keV, exploit methods currently used at synchrotrons and implement them in a laboratory size. The goal is to provide an X-rays average flux up to 10^13ph/s. the X-rays are generated by head-on collisions between bunches of...
Barium Titanate (BaTiO3 or BT) ceramics were synthesized by using a combination of solid state and mechanochemical method. The thermal decomposition, phase formation, microstructure and electrical behavior are investigated by TG-DSC analysis, X-ray diffraction, FE-SEM measurements and Impedance Analyzer respectively. The X-ray diffraction patterns show cubic symmetry without secondary phase....
We report here a microscopic theoretical model showing the influence of dynamic Jahn-Teller (J-T) distortion on the Raman active excitation peaks in the CMR manganite systems. This model Hamiltonian for the system consists of J-T distortion in e_g band, the double-exchange interaction and the Heisenberg spin-spin interaction among the core electrons. Further the phonons are coupled to e_g...
Since the discovery of graphene in 2004, many new 2 dimensional materials have been synthesised. These form ideal systems to model quantum mechanically and to modify computationally, for example by doping or the creation of various defects, with the view to alter the physical, electronic, magnetic, etc., properties. Within the framework of density functional theory, a number of 2D systems will...
Transition-metal perovskite oxides are studied theoretically and experimentally because of their various exotic properties, including ferroelectrics, ferromagnetism, superconductivity, multiferroic and colossal magnetoresistance effects. Now Multiferroics have found intensive interest among researcher due to its excellent relation between spin, phonon, charge ordering and FE ordering. The...
This research seeks to understand the role of ScCl3, ZrCl4, and VCl3 catalysts in NaAlH4. Some researchers suggests that the catalyst serves to decrease the H2 gas desorption temperature in these materials by influencing the reaction rates. Others suggest that the catalyst acts more as a dopant, thereby mitigating (enhancing) diffusion rates is in the solid phases. Changes in the hydride...
The outbreaks of water-borne diseases are a common occurrence in developing countries and has claimed millions of lives in the recent years despite the many water purification approaches in use. This is because most of these water purification systems are inefficient in removal of all pathogens especially viruses from drinking water. Furthermore, the diatomaceous earth (DE) wastes have not...
