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 5 of 5 for “"discrete breathers"”.
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Spectroscopy of Discrete Breathers
… a spatial localized and time periodic state (discrete breather) and small amplitude plane waves is studied.
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Localisation of Bose-Einstein condensates in optical lattices
… potential or, in the case of deep potentials, a discrete model using the Discrete Nonlinear Schrodinger equation. Spatially localised modes, known as lattice solitons in the continuous model, or discrete breathers in the discrete model, can occur and are the focus of this thesis. Theoretical and …
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Quantum breathers in small networks: Dynamics, tunneling, correlations, and application to Josephson cells
We address the excitation of quantum breathers in small nonlinear networks of two and three degrees of freedom, in order to study their properties. The invariance under permutation of two sites of these networks substitutes the translation invariance that is present in nonlinear lattices, where …
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Coupled mode reductions and rotating wave approximations in nonlinear equations
… dimensional ansatz. Next, we consider a class of discrete nonlinear Klein-Gordon equations with damping and parametric drive. Using small amplitude ansatzs, one usually approximates the equations using a damped, driven discrete nonlinear Schrodinger type equation. Here, we show for the first time …
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An Exploration of Nonlinear Locally Resonant Metamaterials with Electromechanical and Topological elements
… Nonlinear elements introduce features such as discrete breathers and frequency shift. Electromechanical metamaterials have been established to have great potential for use in simultaneous energy harvesting in addition to vibration control. Furthermore, metamaterials with quasiperiodic …