Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"correlation effects"”.
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Correlation Effects In Nanoparticle Composites: Percolation, Packing And Tunneling
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Interference and correlation effects in multimode quantum systems. Multimode systems.
… is the theoretical study of interference and correlation effects in multimode and continuum mode quantum systems. We are concerned with interference effects in multiport devices which in a sense are generalised Mach-Zehnder interferometers. It is shown how these multimode devices can be …
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Study of localization and correlation effects in disordered electronic systems
This thesis describes attempts to study the effects of localization and electronic correlation in disordered electronic systems so as to see their role in bringing about or affecting, independently or in combination, such features as the metal-insulator transition, response functions like the …
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A photoemission study of quasiparticle excitations, electron-correlation effects and magnetization dynamics in thin magnetic systems
… part of this thesis, the strength of electron correlation effects in the spin-dependent electronic structure of ferromagnetic bcc Fe(110) and hcp Co(0001) is investigated by means of spin- and angle-resolved photoemission spectroscopy. The experimental results are compared to theoretical …
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Analyzing Electronic Correlation Effects in Molecules and Semiconductor Point Defects from First Principles Beyond Density Functional Theory
… to appropriately account for electronic correlation effects. Density functional theory (DFT) has been one of the most popular methods to perform calculations on correlated systems, due to the combination of numerical efficiency and precision in many applications. However, traditional DFT …
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Rigorous Studies of the Electronic Structures of Molecules and Molecular Complexes. Electron Correlation Effects in the Hydrogen Bonding of Small Dimeric Systems (Hydrogen Fluoride, Carbon Monoxide, Nitrogen, Hydrogen Cyanide)
The effects of electron correlation in the weakly interacting dimers of hydrogen fluoride with the nitrogen molecule, carbon monoxide and hydrogen cyanide are presented. While linear equilibrium structures are found for these complexes, an attempt is made to elucidate their vibrationally averaged …
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Wavefunction-based method for excited-state electron correlations in periodic systems - application to polymers
… power of quantum-chemical programs designed for correlation calculations of finite molecules. Using localized Hartree-Fock (HF) orbitals (both occupied and virtual ones), an effective Hamiltonian which can easily be transferred from finite to infinite systems is built up. Correlation corrections …
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Theoretical study of direct and indirect single ionisation by electron impact /
… of the ionisation effect are determined. The correlation effects of Fe3+ and W5+ ions were also investigated and the experimental data of these ions and Se3+ ion were explained for the first time. The introduction discusses the importance of plasma studies and the need to investigate …
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Tiesioginės ir netiesioginės viengubos jonizacijos elektronų smūgiais tyrimas /
… of the ionisation effect are determined. The correlation effects of Fe3+ and W5+ ions were also investigated and the experimental data of these ions and Se3+ ion were explained for the first time. The introduction discusses the importance of plasma studies and the need to investigate …
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Correlations in the one-dimensional Hubbard model
Correlation effects in the one-dimensional Hubbard model are studied by application of the L-resolvent method. The calculations are well beyond one-particle mean field approximation. All correlations involving two neighboring sites are included exactly and higher order correlations are …
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Correlation in the One Dimensional Electron Gas
… from a liquid to a state with rather strong 4kF correlations. This crossover takes place around 22 microm-1, near the density where the electron localization occurs in the experiment. The charge and spin velocities determined from the long wavelength excitation spectra are also in good agreement …
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Automatic real-time facial expression recognition for signed language translation
… data may contain. We attribute this in part to correlation effects within the Cohn-Kanade database. We also developed a system for detecting FACS action units based on Haar features and the Adaboost boosting algorithm. This method achieves equally high recognition accuracy for certain AUs but …
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Muonium in C₆₀ fullerites : studies of structural and electronic properties
… fullerites indicating that electron-electron correlation effects may be important in determining the electronic structure of these solids.
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Electron Correlation Studies of Weakly Bonded Systems
… is found to be chemically bonded due to the correlation effects of the d orbitals.
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Photophysics of carbon nanotubes
… the nanotube sidewall and the enhanced electron correlation effects associated with one dimensionality. The optical transition energies in small-diameter carbon nanotubes show a strong dependence on their geometrical structure, as was first observed in the photoluminescence experiments. The …
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Disentangle model differences and fluctuation effects in DPD simulations of diblock copolymers
… mean-field theory neglecting system fluctuations/correlations while DPD simulations fully incorporate such effects, the model differences are mixed with the fluctuation/correlation effects in their comparison. Here we report the SCF phase diagram for exactly the same model system as used in DPD …
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A polarized helium ion beam for surface electronic structure studies
… new information on surface magnetism, electron correlation effects, and the dynamics of the ion neutralization process. Production of the polarized helium ion beam involves optically pumping helium metastable atoms in an rf electric discharge with subsequent extraction of ions created by …
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Advances in Multiconfiguration Pair Density Functional Theory and Applications to Excited State, Singlet-Triplet Gaps and Magnetism
… between electrons, also known as electron correlation, whose description is a major challenge for modern electronic structure methods. The correct description of electron correlation has been a major challenge in the development of these methods.A recent computational method called …
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Interaction effects in topological insulators
… approaches to study the shortrange interaction effects in topological insulators. We start with the Kane-Mele model on the decorated honeycomb lattice and study the stability of topological insulator phase against different perturbations. We establish an adiabatic connection between a …
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Microscopic Theory of the Knight Shift
… spin ${\bf g}$ tensor. Local orbital electron correlation effects are included using the mean-field decoupling procedure of Lacroix. The metallic contributions to the Knight shift resonance frequency and linewidth shifts are evaluated to leading orders in the hyperfine and Anderson excitation …
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