Search for dissertations about: "superfluidity"
Showing result 1 - 5 of 7 swedish dissertations containing the word superfluidity.
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1. Ultracold atoms in optical potentials : from noise-induced transport to superfluidity
Abstract : In this thesis, both experimental studies and numerical simulations of ultracold atoms in optical potentials are presented in a collection of nine scientific papers. In particular, noise-induced transport in dissipative optical lattices and superfluid properties of Bose-Einstein condensates have been studied. READ MORE
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2. Superfluidity and Supersolidity in Ultracold Atomic Gases Beyond Mean Field
Abstract : This thesis investigates ultracold bosonic systems using an extended mean-field formalism with a focus on their superfluid and supersolid properties. The dissertation comprises five chapters and four articles, where the chapters provide some background to the research put forward in articles. READ MORE
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3. Vortices and Persistent Currents in Rotating Bose Gases - a Diagonalization Approach
Abstract : In this thesis, I explore the behavior of rotating ultra-cold Bose gases, by diagonalizing the Hamiltonian. This method has the advantage of being exact in the limit of weak interactions, and thus is a useful complement to the more commonly used Gross-Pitaevskii (GP) equation, which relies on a mean-field approximation. READ MORE
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4. Bose-Einstein Condensation of Magnetic Excitons in Semiconductor Quantum Wells
Abstract : In this thesis regimes of quantum degeneracy of electrons and holes in semiconductor quantum wells in a strong magnetic field are studied theoretically. The coherent pairing of electrons and holes results in the formation of Bose-Einstein condensate of magnetic excitons in a single-particle state with wave vector K. READ MORE
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5. Phase transitions in novel superfluids and systems with correlated disorder
Abstract : Condensed matter systems undergoing phase transitions rarely allow exact solutions. The presence of disorder renders the situation even worse but collective Monte Carlo methods and parallel algorithms allow numerical descriptions. READ MORE