Relaxation Processes and Exciton-Phonon Interactions in Nanocomposites Based on CdSe/ZnS Semiconductor Quantum Dots and Porphyrin Molecules

Russian Physics Journal - Using spectral-kinetic data obtained for nanoassemblies based on CdSe/ZnS semiconductor quantum dots and tetrapyridylporphyrin molecules in methylcyclohexane-toluene...     

Switching Autowaves in Materials with Dislocations and Martensitic Transformations

Russian Physics Journal - The paper focuses on the investigation of the strain kinetics at the yield point of materials with shear dislocations and martensitic transformations at a microlevel. In...     

Impurity-related optical response in a 2D and 3D quantum dot with Gaussian confinement under intense laser field

ABSTRACT

Using the two-dimensional (2D) diagonalisation method, the impurity-related electronic states and optical response in a 2D quantum dot with Gaussian confinement potential under nonresonant intense laser field are investigated. The effects of a hydrogenic impurity on the energy spectrum and binding energy of the electron and also intersubband optical absorption are calculated. The obtained numerical results show that the degeneracies of the excited electron states are broken and the absorption spectrum exhibits a redshift with the values of the laser field. The findings indicate a new degree of freedom to tune the performance of novel optoelectronic devices, based on the quantum dots and to control their specific properties by means of intense laser field and hydrogenic donor impurity. Using the same Gaussian confinement model, the electronic properties of a confined electron in the region of a spherical quantum dot are studied under the combined effects of on-centre donor impurity and a linearly polarised intense laser radiation. The three-dimensional problem is used to theoretically model, with very good agreement, some experimental findings reported in the literature related to the photoluminescence peak energy transition.     

Investigation of the Influence of the Underlying Terrain on the Impedance of a System of Two Randomly Oriented Parallel Linear Antennas

Russian Physics Journal - The results of a numerical investigation of the influence of inhomogeneous dielectric media on the impedance of a system of two parallel linear antennas randomly...     

Peculiarities of Structure and Morphology of Copper-Cerium Nanopowders Produced by Laser Ablation

Russian Physics Journal - Copper-cerium nanopowders CuOx–CeO2 (mass ratio Cu:Ce = 6:100) are prepared by mixing the dispersions of the copper and cerium oxides produced by the method of pulse...     

Surface Modification of ZrO2–3Y2O3 with Highintensity Pulsed N2+ Ion Beams

Russian Physics Journal -     

A 19F NMR Study of the Transmissive Ability of Boron-Containing Bridged Systems with Three- and Four-Coordinated Boron Atoms

Two series of model compounds, Ar₂BOC₆H₄F-4 and Ar₂B(Py)OC₆H₄F-4, containing three-and four-coordinated boron atoms, have been synthesized. It was established by ¹⁹F NMR technique that both systems possess a similar transmissive ability that is in intermolecular coordination with pyridine does not influence the transmissive properties of the boron-oxygen binuclear bridging group. The solvent polarity does not influence the electron transmission in the boron complexes studied.     

Crystal structure of phenyl-β-methyl-pyridyl hydroxyimide,C13H12N2O

Phenyl-β-methyl-pyridyl hydroxyimide crystallizes in the form of prismatic crystals in the space group P 2₁ with Z = 4, a = 11.401(4) Å, b = 7.793(3) Å, c = 12.766(4) Å and β = 92.97°. The structure was solved by direct methods and was refined by block diagonal least squares calculation to a final value of 0.05. The pyridyl ring in molecule (II) is slightly distorted, all the other rings as expected are planar.