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 9 of 9 for “"mean-field theories"”.
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Scattering of many-fermion systems in time-dependent mean field theories
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Quasi-condensation in low-dimensional Bose gases
… fluctuates strongly. It is shown that modified mean-field theories based on a symmetry-breaking approach can even characterise phase coherence properties of such a quasi-condensate properly. A correct description of the transition from the degenerate ideal Bose gas to the quasi-condensate, which …
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Aspects of spin-charge separation in high Tc cuprates
… can be readily understood from slave boson mean field theories of the t-J model that yield a variety of phases like the uRVB phase (strange metal), d-wave RVB phase (spin gap), and the superconducting phase. This thesis is concerned with improving this picture by considering important …
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Mean-field theory for the dynamics of superfluid fermions in the BCS-BEC crossover
We use mean-field theory to investigate the dynamics of superfluid fermions. This thesis includes our two works. The first one is to study Josephson oscillations and self-trapping of superfluid fermions in a double-well potential with time-dependent Bogoliubov-de Gennes equations. We investigate …
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Physical interpretation of coarse-grained bead-spring models of complex fluids
… of energy minimization and perturbation in field theories. At the same time, simulations of highly coarse-grained particle-based models, such as lattice chain Monte Carlo and bead-spring simulations, have emerged as a promising alternative. The application of these methods, however, has been …
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Fluctuation contributions to the heat capacity of superconducting thin films
… Bismuth-Antimony films of various thicknesses. Mean field theories predict a discontinuous jump in heat capacity at the transition, and this has ""been observed in experiments on pure bulk superconductors. The presence of thermodynamic fluctuations causes a breakdown of mean field theory if one …
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Experimental study of the spin-glass phase diagram
… examined as a function of temperature, magnetic field, random anisotropy, and uniaxial anisotropy and the results are compared to recent mean-field theories. It is clearly demonstrated through measurements of the magnetic relaxation processes in the amorphous spin-glass (FeO.64MnO.36)75P16B6A13 …
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Unique cluster expansion for reliable first-principles prediction of alloy thermodynamics and phase diagrams
… is used in Monte Carlo (MC) simulations and/or mean-field theories (MFTs) to construct temperature-composition phase diagrams for FCC Ca-Sr, Pd-Rh and Ag-Au (ordering), explaining various features and comparing them to available experiment data. The ECI of Ag-Au system also compare well to those …
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Collective dynamics in flowing suspensions of swimming micro-organisms
… of which are universal in the far field. This universality allows the development of mean-field theories to describe such suspensions over length scales much larger than the particle dimensions. In this work, we make use of a recently developed kinetic model to investigate pattern …