Nonlinear dynamics in quantum fluids of light
The propagation of light in nonlinear media is well described by a 2D nonlinear Schrödinger equation (NLSE) within the paraxial approximation, which is equivalent to the GrossPitaevskii equation (GPE), the mean-field description for the dynamics of Bose-Einstein condensates (BECs). As a product of...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/56776 |
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| Resumo: | The propagation of light in nonlinear media is well described by a 2D nonlinear Schrödinger
equation (NLSE) within the paraxial approximation, which is equivalent to the GrossPitaevskii equation (GPE), the mean-field description for the dynamics of Bose-Einstein
condensates (BECs). As a product of this similarity, we can establish the figure of a quantum
fluid of light. Quantum fluids of light have been used for theoretical and experimental
investigations of phenomena already studied and realised in BECs. In this thesis, we
describe the mechanisms that make the conception of a quantum fluid of light possible for
different experimental platforms. Furthermore, we present a study on the formation of
self-bound droplets of light in hot atomic vapours, our chosen nonlinear medium, in an
attempt to obtain a mapping between experimental parameters typically used in BEC
experiments and those needed to observe the analogous phenomenon in atomic vapours.
We investigate the static properties of the system, providing a phase diagram for the
different and possible solutions for the optical regimes of interest. Finally, we systematically
study droplet dynamics, focusing on the behaviour of the collective monopole excitation
and the dynamic formation of these objects under realistic experimental conditions. |
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