Search for dissertations about: "DNLS"
Found 4 swedish dissertations containing the word DNLS.
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1. Comparisons between classical and quantum mechanical nonlinear lattice models
Abstract : In the mid-1920s, the great Albert Einstein proposed that at extremely low temperatures, a gas of bosonic particles will enter a new phase where a large fraction of them occupy the same quantum state. This state would bring many of the peculiar features of quantum mechanics, previously reserved for small samples consisting only of a few atoms or molecules, up to a macroscopic scale. READ MORE
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2. Theoretical studies of Bose-Hubbard and discrete nonlinear Schrödinger models : Localization, vortices, and quantum-classical correspondence
Abstract : This thesis is mainly concerned with theoretical studies of two types of models: quantum mechanical Bose-Hubbard models and (semi-)classical discrete nonlinear Schrödinger (DNLS) models.Bose-Hubbard models have in the last few decades been widely used to describe Bose-Einstein condensates placed in periodic optical potentials, a hot research topic with promising future applications within quantum computations and quantum simulations. READ MORE
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3. Discrete aperiodically ordered structures in low dimensions
Abstract : This thesis deals with discrete models for one-dimensional (1D) and two-dimensional (2D) aperiodic systems such as quasicrystals and aperiodic superlattices. Various model systems are investigated using different forms of the tight-binding (TB) approximation. READ MORE
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4. A periodically Ordered Structures in One Dimension
Abstract : This thesis deals with different aspects of aperiodically ordered structures in one dimension. The approach is entirely theoretical, and the models used have various relevance for real systems. READ MORE