Ultracold quantum matter

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Testing and design of a lens system for atom trapping and fluorescence detection

(2004)

Authors:

P Baranowski, J Zacks, G Hechenblaikner, CJ Foot
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Properties of quasi two-dimensional condensates in highly anisotropic traps

(2004)

Authors:

G Hechenblaikner, JM Krueger, CJ Foot
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Quasi-2D Confinement of a BEC in a Combined Optical and Magnetic Potential

(2004)

Authors:

NL Smith, WH Heathcote, G Hechenblaikner, E Nugent, CJ Foot
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Experimental observation of the tilting mode of an array of vortices in a dilute Bose-Einstein condensate.

Phys Rev Lett 93:8 (2004) 080406

Authors:

NL Smith, WH Heathcote, JM Krueger, CJ Foot

Abstract:

We have measured the precession frequency of a vortex lattice in a Bose-Einstein condensate of Rb87 atoms. The observed mode corresponds to a collective motion in which all the vortices in the array are tilted by a small angle with respect to the z axis (the symmetry axis of the trapping potential) and synchronously rotate about this axis. This motion corresponds to excitation of a Kelvin wave along the core of each vortex and we have verified that it has the handedness expected for such helical waves, i.e., precession in the opposite sense to the rotational flow around the vortices.
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Optimized evaporative cooling using a dimple potential: An efficient route to Bose-Einstein condensation

Journal of Physics B: Atomic, Molecular and Optical Physics 37:15 (2004) 3187-3195

Authors:

ZY Ma, CJ Foot, SL Cornish

Abstract:

The realization of Bose-Einstein condensation of 133Cs relies on an innovative evaporative cooling technique using a dimple potential. Correctly loading an atomic gas into such a potential produces a dense sample with a high phase space density, ideal for evaporative cooling. We have numerically simulated both the loading process and the subsequent evaporative cooling from a dimple potential in order to elucidate the optimization of this technique. Furthermore, we demonstrate that this technique would be effective in cooling 85Rb to quantum degeneracy and describe a simple scheme for its implementation.
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