Browsing by Keywords "Electron energy levels"
Now showing items 120 of 25

Accurate method for obtaining band gaps in conducting polymers using a DFT/hybrid approach
(American Chemical Society, 1998)DFT calculations on a series of oligomers have been used to estimate band gaps, ionization potentials, electron affinities, and bandwidths for polyacetylene, polythiophene, polypyrrole, polythiazole, and a thiophene  ... 
Balancing energy loads in wireless sensor networks through uniformly quantized energy levelsbased clustering
(2010)Clustering is considered a common and an effective method to prolong the lifetime of a wireless sensor network. This paper provides a new insight into the cluster formation process based on uniformly quantizing the residual ... 
Bound electron pairs in strongly correlated models of hightemperature superconductivity
(Natsional'na Akademiya Nauk Ukrainy, 1998)The groundstate energy of two electrons on a ring is calculated for the onedimensional Hubbard model with positive and negative onsite interaction and for the contraction model with additive and multiplicative interaction ... 
Collective oscillations in a twodimensional BoseEinstein condensate with a quantized vortex state
(The American Physical Society, 2005)We study the effect of lower dimensional geometry on the frequency splitting of the quadrupole oscillations of a harmonically trapped BoseEinstein condensate due to the presence of a quantized vortex. To study the effect ... 
Contraction of atomic orbitals in the oxygen anion network and superconductivity in metal oxide compounds
(Scientific and Technical Research Council of Turkey  TUBITAK,Turkiye Bilimsel ve Teknik Arastirma Kurumu, 1996)Anion network in the CuO2 plane of metaloxide compound is considered as an intrinsichole metal with holes rather than electrons comprising a Fermi liquid immersed in the background of negative O2 ions. Due to the ... 
Density functional theory investigation of substituent effects on building blocks of conducting polymers
(Elsevier, 1999)Substituted heterocyclic dimers were calculated employing density functional theory (DFT) and analyzed with the natural bond orbits method (NBO). Substitution in 3 and 4positions leads to parallel shifting of HOMO and ... 
Does the donoracceptor concept work for designing synthetic metals? 1. theoretical investigation of poly(3cyano3′hydroxybithiophene)
(American Chemical Society, 2002)Homo and copolymers of hydroxythiophene and cyanothiophene have been investigated by employing density functional theory with the aim of determining the effect of donoracceptor substitution on the electronic structure. ... 
Does the donoracceptor concept work for designing synthetic metals? 2. theoretical investigation of copolymers of 4(dicyanomethylene)4Hcyclopenta[2, 1b: 3, 4b′]dithiophene and 3, 4(ethylenedioxy)thiophene
(American Chemical Society, 2002)Density functional theory (DFT) calculations were performed on oligomers of 3,4(ethylenedioxy)thiophene (EDOT), 4(dicyanomethylene)4Hcyclopenta[2,1b:3,4b′]dithiophene (CDM), and cooligomers (CDM/ EDOT). Oligomer ... 
Dynamical screening effects in hotelectron scattering from electronhole plasma and LOphonon modes in quantum wires
(Elsevier, 1996)We present a fully dynamical and finite temperature study of the hotelectron momentum relaxation rate and the power loss in a coupled system of electronhole plasma and bulk LOphonons in a quantum wire structure. ... 
Effect of crosssectional geometry on the RPA plasmons of quantum wires
(Pergamon Press, 1994)The effect of crosssectional geometry on both the intrasubband plasmon and intersubband plasmon of a quantum wire is investigated within a twosubband RPA scheme. Exact analytical electronic wavefunctions for circular, ... 
Electronic and magnetic properties of zinc blende halfmetal superlattices
(A I P Publishing LLC, 2004)Zinc blende halfmetallic compounds such as CrAs, with large magnetic moments and high Curie temperatures, are promising materials for spintronic applications. We explore layered materials, consisting of alternating ... 
Energy and mass of 3D and 2D polarons in the overall range of the electronphonon coupling strength
(Institute of Physics Publishing Ltd., 1994)The groundstate characterization of the polaron problem is retrieved within the framework of a variational scheme proposed previously by Devreese et al for the bound polaron. The formulation is based on the standard ... 
Energy relaxation of electrons in InGaN quantum wells
(Springer New York LLC, 201504)In this study, electron energy relaxation mechanisms in HEMT structures with different InxGa1−xNchannel quantum well (QW) widths are investigated. Theoretical value of the inelastic scattering rates is carried out at ... 
Infrared photoluminescence from TlGaS2 layered single crystals
(Wiley  V C H Verlag GmbH & Co., 2004)Photolimuniscence (PL) spectra of TlGaS2 layered crystals were studied in the wavelength region 5001400 nm and in the temperature range 15115 K. We observed three broad bands centered at 568 nm (Aband), 718 nm (Bband) ... 
Lowtemperature photoluminescence spectra of layered semiconductor TlGaS2
(Pergamon Press, 1998)Photoluminescence (PL) spectra of TlGaS2 layered single crystals were studied in the wavelength region 500860 nm and in the temperature range 9.5293 K. We observed a total of three PL bands centered at 568 nm (2.183 eV, ... 
Magnetic and electric AharonovBohm effects in nanostructures
(Elsevier BV, 1996)The paper reviews and extends the magnetic AharonovBohm effect (persistent current, resistance oscillation) in normalmetal rings including spinindependent and spindependent hopping, Zeeman splitting, magnetic textures ... 
Magneticfield dependence of lowtemperature mobility in quasionedimensional electron systems
(Institute of Physics Publishing Ltd., 1994)We study the mobility of a quasionedimensional (Q1D) electron system in the presence of an axial magnetic field at low temperatures. We consider the mobility limits for remoteimpurity scattering, homogeneousbackground ... 
Nanosecond sumfrequency generating optical parametric oscillator using simultaneous phase matching
(Optical Society of American (OSA), 2005)We report a nanosecond sumfrequency generating optical parametric oscillator based on a single KTiOAsO4 crystal that is simultaneously phase matched for optical parametric generation and sumfrequency generation. Pumped ... 
Polarization of radiation in multipole JaynesCummings model
(Taylor & Francis Ltd, 2002)We discuss the spatial properties of quantum radiation emitted by a multipole transition in a single atom. It is shown that the polarization of multipole radiation and quantum fluctuations of polarization change with ... 
The role of the interface in germanium quantum dots: when not only size matters for quantum confinement effects
(Royal Society of Chemistry, 2015)Quantum confinement (QC) typically assumes a sharp interface between a nanostructure and its environment, leading to an abrupt change in the potential for confined electrons and holes. When the interface is not ideally ...