| Título: | Condensation of bosons with several degrees of freedom |
| Autores: | Delgado López, Rafael |
| Tipo de documento: | texto impreso |
| Fecha de publicación: | 2013-06 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = No publicado , Materia = Ciencias: Física: Física de materiales , Tipo = Trabajo Fin de Máster |
| Resumen: |
The condensation of the spinless ideal charged Bose gas in the presence of a magnetic field is revisited as a first step to tackle the more complex case of a molecular condensate, where several degrees of freedom have to be taken into account. In the charged bose gas, the conventional approach is extended to include the macroscopic occupation of excited kinetic states lying in the lowest Landau level, which plays an essential role in the case of large magnetic fields. In that limit, signatures of two diffuse phase transitions (crossovers) appear in the specific heat. In particular, at temperatures lower than the cyclotron frequency, the system behaves as an effectively one-dimensional free boson system, with the specific heat equal to (1/2) NkB and a gradual condensation at lower temperatures. In the molecular case, which is currently in progress, we have studied the condensation of rotational levels in a two–dimensional trap within the Bogoliubov approximation, showing that multi–step condensation also occurs. |
| En línea: | https://eprints.ucm.es/id/eprint/25978/1/Delgado%20L%C3%B3pez%2C%20Rafael.pdf |
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