The present thesis is devoted to an analysis of the possibility of Bose condensates
supporting persistent currents in the ring geometry. Our analysis is based on an
approach developed by F. Bloch which focuses on the ground state energy of the
condensate as a function of its angular momentum L. According to this approach,
persistent currents are stable if the energy exhibits a local minimum at some nonzero
angular momentum. We have used this approach for a single-species gas within
a mean- eld approximation to show that persistent currents are stable at integral
multiples of N*hbar, where N is the number of atoms in the system, provided a certain
interaction parameter exceeds some critical value. These results are extended to a
binary mixture of bosonic atoms and we show that the system is still capable of
supporting persistent currents under certain conditions. Some of our conclusions
contradict those appearing in the earlier literature. / Thesis (Master, Physics, Engineering Physics and Astronomy) -- Queen's University, 2012-03-27 10:05:21.831
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OKQ.1974/7037 |
| Date | 28 March 2012 |
| Creators | ANOSHKIN, KONSTANTIN |
| Contributors | Queen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.)) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Rights | This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. |
| Relation | Canadian theses |
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