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 13 of 13 for “"Quantum statistics"”.
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ΚΒΑΝΤΙΚΗ ΤΡΙΒΗ ΣΕ ΠΕΡΙΟΔΙΚΟ ΔΥΝΑΜΙΚΟ
IN THIS WORK THE QUANTUM FRICTION PROBLEM IS STUDIED USING THE HAMILTONIAN C-K(CALDIROLA-KANAI) FOR PERIODIC MATIEU-TYPE POTENTIALS. FURTHERMORE THIS IS EXTENDED TO SPACE AND TIME DEPENDED PERIODIC SYSTEMS. THEN THE PROBLEM IS CONSIDERED FOR UNIFORM MAGNETIC FIELD AND THE QUESTION OF QUANTUM …
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Matsubara Dynamics and its Practical Implementation
This thesis develops a theory for approximate quantum time-correlation functions, Matsubara dynamics, that rigorously describes how to combine quantum statistics with classical dynamics. Matsubara dynamics is based on Feynman's path integral formulation of quantum mechanics and is expected to …
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Statistical distributions in the thermal model
… a large number of conserved charges as well as quantum statistics. The central limit theorem and its related expansions provide a flexible mathematical tool for calculation of statistical fluctuations, and allows for application of the canonical ensemble to high energy particle collision data. A …
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ΚΒΑΝΤΙΚΗ ΘΕΩΡΙΑ ΣΤΟ ΧΩΡΟ ΤΩΝ ΦΑΣΕΩΝ ΚΑΙ ΕΦΑΡΜΟΓΕΣ ΣΕ ΔΙΑΦΟΡΑ ΣΥΣΤΗΜΑΤΑ
… IN THE SECOND CHAPTER WE CONSTRUCT GENERAL QUANTUM-MECHANICAL REPRESENTATION. IT IS PROVED THAT ALL THE ABOVE REPRESENTATIONS ARE EQUIVALENT. IN THE THIRD CHAPTER THE SOLUTION OF THE WIGNER EQUATION IS DEVELOPED IN SERIES OF POWERS OF H. FOR THE CALDIROLA-KANAI HAMILTONIAN, THE STANDARD …
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Quantum saturation and condensation of excitons in copper (I) oxide
… in Cu$\sb2$O provide evidence for degenerate quantum statistics and Bose-Einstein condensation of this nearly ideal gas. We model the time dependence of this bosonic system including exciton decay mechanisms, energy exchange with phonons, and interconversion between ortho (triplet-state) and …
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Frequency conversion in nonlinear optical waveguides : from classical to quantum applications
… linear and nonlinear optics, photonics and quantum physics. It combines the phenomena of nonlinearoptical frequency conversion with waveguiding and coupling, taking advantage of new opportunities presented by advances in fabrication technologies of micro- and nano-waveguides. In this …
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Frequency conversion in nonlinear optical waveguides : from classical to quantum applications
… linear and nonlinear optics, photonics and quantum physics. It combines the phenomena of nonlinearoptical frequency conversion with waveguiding and coupling, taking advantage of new opportunities presented by advances in fabrication technologies of micro- and nano-waveguides. In this …
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Majorana qubits in non-Abelian topological superconductors
… namely Majorana fermions, which obey non-Abelian quantum statistics. They are exploited as hardware platforms for fault-tolerant topological quantum computing. In this thesis, we primarily study the non-topological decoherence ef- fects existing in realistic systems and how they affect the …
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Exploring Atom-Light Scattering in the Quantum Regime
… are promising platforms for exploring modern quantum science and technologies, such as quantum simulation and quantum computation. Here, light is the essential tool to manipulate and probe these systems. However, unlike in condensed matter systems where scattering experiments are routinely …
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Dissipative Matsubara Dynamics
… as a controlled minimal approximation combining quantum statistics with classical dynamics, while conserving the quantum Boltzmann distribution. It was then shown that both RPMD and CMD are approximations to Matsubara dynamics, thus providing a firm theoretical ground for these methods. …
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On the path integral formulation and the evaluation of quantum statistical averages
Four problems of physical interest have been solved in this thesis using the path integral formalism. Using the trigonometric expansion method of Burton and de Borde (1955), we found the kernel for two interacting one dimensional oscillators• The result is the same as one would obtain using a …
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Nonequilibrium green function approach to elastic and inelastic spin-charge transport in topological insulator-based heterostructures and magnetic tunnel junctions
… and spin transport phenomena that occur at the quantum level in nano-structures. This thesis spans the areas of quantum transport theory through time-dependent systems, electron-boson interacting systems and systems of interest to spintronics. A common thread in the thesis is to develop the …