We present a detailed experimental investigation into Bose-Einstein condensates loaded into a one-dimensional optical standing wave at the Bragg condition.
The main emphasis of this thesis is the experimental and theoretical investigation into Bragg spectroscopy performed on circularly accelerating Bose-Einstein condensates. The condensate undergoes circular micromotion in a magnetic time-averaged orbiting potential trap and the effect of this motion on the Bragg spectrum is analysed. A simple frequency modulation model is used to interpret the observed complex structure, and broadening effects are considered using numerical solutions to the Gross-Pitaevskii equation.
The second part of this thesis is an experimental investigation into the effect of nonlinearity on the non-adiabatic loading of a condensate into a optical lattice at the Brillouin zone boundary. Results of using a phase shifting technique to load a single Bloch band in the presence of strong interactions are presented. We observe a depletion of the condensed component, and we propose possible mechanisms for this result.
| Identifer | oai:union.ndltd.org:ADTP/217450 |
| Date | January 2005 |
| Creators | Geursen, Reece Wim, n/a |
| Publisher | University of Otago. Department of Physics |
| Source Sets | Australiasian Digital Theses Program |
| Language | English |
| Detected Language | English |
| Rights | http://policy01.otago.ac.nz/policies/FMPro?-db=policies.fm&-format=viewpolicy.html&-lay=viewpolicy&-sortfield=Title&Type=Academic&-recid=33025&-find), Copyright Reece Wim Geursen |
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