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 46 for “"Coulomb interaction"”.
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Hubbard-corrected density functional theory : sensitivity to projection-space and renormalization of Coulomb interaction.
… correlations. By introducing an explicit on-site Coulomb interaction, DFT+U can substantially improve the description of electronic structure, lattice properties, and phase stability in transition-metal oxides and related correlated materials. However, despite its conceptual simplicity and broad …
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Analysis of coulomb interaction using modified particle-particle-particle-mesh method in Monte Carlo simulation
… Carlo (EMC) simulator, MOCA3D, to treat the Coulomb scattering, i.e. carrier-carrier and carrier-impurity scattering. We show that most of the problems in the particle{mesh (PM) based scattering rate approach are solved by the P3M method. The properties of the Coulomb scattering are analyzed …
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SPIN-ORBIT COUPLING IN STRONGLY CORRELATED SYSTEMS
… elements, both strong spin-orbit coupling and Coulomb interactions are possible to exist. Both can significantly change the properties of materials. The coexistence of them can induce more interesting phenomena in solids. In this dissertation, three different cases involved with spin-orbit …
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Measurements of the Absolute Cross Section of the Three-body Photodisintegration of Helium-3 Between E[gamma] = 11.4 MeV and 14.7 MeV at HIGS
… three-body calculations. The inclusion of the Coulomb interaction in the three-body problem has been a long-standing challenge in theoretical nuclear physics. The present experimental data were found to be in good agreement with the state-of-the-art theory, which includes a full treatment of …
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A study of electron-positron pair equilibria in models of compact X- and gamma-ray sources
… The pairs are assumed to be heated by Coulomb interaction with the much hotter protons and to cool by bremsstrahlung emission, Compton scattering and annihilation. Two parameters, the 'proton optical depth' and the compactness, characterize each equilibrium state.
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First principles energy density and its applications to selected polar surfaces and interfaces
… energy density which describes the long-range Coulomb interaction, a term that includes the exchange-correlation interaction, and other contributions that depend on the external potential.
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The influence of coulomb potential fluctuation on c-axis tunneling in cuprates
… between two CuO2 planes including the in-plane Coulomb interaction. With a general assumption that the spectral function of the Coulomb uctuation is ohmic, the solution of the transmission rate in the model is obtained by mapping the Coulomb potential fluctuation to phonon coupling of the …
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Ultrafast spatiotemporal dynamics of photoexcitations in two-dimensional semiconductors
… are largely dominated by the screening of the Coulomb interaction by excited states. At high excitation densities, when the screening of the Coulomb interaction is such that the excitons are no longer stable, we observe their complete ionization into a dense plasma of unbound electrons and …
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MAJORANA FERMION IN TOPOLOGICAL SUPERCONDUCTOR AND MOTT‐SUPERFLUID TRANSITION IN CIRCUIT‐QED SYSTEM
… Dresselhaus spin-orbit couplings with/without Coulomb interaction and disorder, and discuss the impact on the transport property. In Part II (Chapter 4), we propose a hybrid quantum architecture for engineering a photonic Mott insulator-superfluid phase transition. The phase diagrams in the …
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Interaction effects in quantum interferometers
… present thesis is to investigate the effects of interactions in interferometers in the integer quantum Hall regime. The behaviour of electrons in condensed matter systems is mostly determined by the repulsive Coulomb interaction. However, under special circumstances the Coulomb interaction can be …
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Measurements of magnetoresistance in amorphous alloys
… potential. Although neither localization nor Coulomb-interaction effects can be said to dominate completely the magnetoresistance of any sample, the electron interactions produce strong positive magnetoresistance at low fields in all of the films. In the weakest spin-orbit coupling case, 8 Cu. …
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Three-particle mechanism for unconventional superconductivity with potential applications in moiré materials
… is non-retarded and non-perturbative in the Coulomb interaction strength, leading to strong coupling behaviors and, in particular, to large critical temperature to Fermi energy ratios. Finally, we argue that this mechanism should apply to some moiré materials, but also to ZrNCl and WTe₂, for …
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Interaction effects in topological insulators
… mean-field 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 …
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In situ x-ray investigations of staging and sequencing potassium-graphite intercalation compounds
… that the intercalate-intercalate screened coulomb interaction is the stabilizing force for staging. Stage mixing is seen to be a direct consequence of finite domain size and entropy. It is unclear whether the discontinuous nature of the stage transitions is a true miscibility gap resulting …
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Two-ion control and polarization forces for precise mass comparisons
… compare the cyclotron frequencies. The Coulomb interaction keeps the separation of the cyclotron guiding centers constant, thus minimizing cyclotron frequency perturbations due to ion-ion interactions. The ions spatially average magnetic field inhomogeneities and electrostatic …
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Physical Realizations of Memory Capacitive Systems
… second plate are attracted to each other due to Coulomb interaction. Hysteresis is obtained in charged-voltage and capacitance-voltage curves. Chaotic behavior is demonstrated for some amplitudes of a sinusoidal applied voltage.</p>
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Universality in the Equilibration of Quenched Yukawa One Component Plasmas
… which have Γ≥1, where Γ is the ratio of the Coulomb interaction energy between neighboring particles to the kinetic energy per particle. All dynamics and physical properties in Yukawa OCPs are expected to be universal in κ when expressed in appropriate scaled units. We study a particularly …
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Peculiar perovskites: Unraveling the unique optical response of hybrid organic-inorganic perovskites from first principles
… and LHOPs are hosts to fascinating microscopic interactions that influence their macroscopic optical and electronic properties. Researchers still debate how interactions between optically excited charge carriers, free-carriers, lattice vibrations, and atomic geometry influence the measured …
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A two-ion balance for high precision mass spectrometry
… the systematic error associated with the Coulomb interaction between the two ions, we keep them about 1 mm apart from each other, on a common magnetron orbit. We have developed novel techniques to measure and control all three normal modes of motion of each ion, including the two strongly …
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The Study of Transition Metal Oxides using Dynamical Mean Field Theory
… metal oxides. In the systems with large Coulomb interaction, especially the on-site interaction, electrons are much more correlated and cannot be described using traditional one-electron picture, thus the name "strongly correlated systems". With strong correlation, there exists a variety …
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