Ultracold quantum matter

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Double-well magnetic trap for Bose-Einstein condensates

Physical Review A - Atomic, Molecular, and Optical Physics 65:6 (2002) 634061-634068

Authors:

NR Thomas, AC Wilson, CJ Foot

Abstract:

A magnetic trapping scheme for neutral atoms for studying the behavior of Bose-Einstein condensates in double-well potentials was presented. The trapping scheme was based on a hybrid of Ioffe-Pritchard and time-averaged orbital potential traps. The double-well magnetic potential obtained using the scheme was found to have readily controllable barrier height and well separation. © Oxford University Press 2002.
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Direct observation of irrotational flow and evidence of superfluidity in a rotating Bose-Einstein condensate

Physical Review Letters 88 (2002) 070406 4pp

Authors:

CJ Foot, G. Hechenblaikner, E. Hodby, S. A. Hopkins
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Vortex nucleation in Bose-Einstein condensates in an oblate, purely magnetic potential

Physical Review Letters 86 (2002) 010405 4pp

Authors:

CJ Foot, E. Hodby, G. Hechenblaikner, S. A. Hopkins
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Influence of background pressure on the stability region of a Paul trap

European Journal of Physics IOP Publishing 22:6 (2001) 563-573

Authors:

Michael Nasse, Christopher Foot
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Temperature dependence of damping and frequency shifts of the scissors mode of a trapped Bose-Einstein condensate.

Physical review letters 86:18 (2001) 3938-3941

Authors:

O Maragò, G Hechenblaikner, E Hodby, C Foot

Abstract:

We have studied the properties of the scissors mode of a trapped Bose-Einstein condensate of 87Rb atoms at finite temperature. We measured a significant shift in the frequency of the mode below the hydrodynamic limit and a strong dependence of the damping rate as the temperature increased. We compared our damping rate results to recent theoretical calculations for other observed collective modes, finding a fair agreement. From the frequency measurements we deduce the moment of inertia of the gas and show that it is quenched below the transition point, because of the superfluid nature of the condensed gas.
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