Ultracold quantum matter

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Vortex nucleation in Bose-Einstein condensates in an oblate, purely magnetic potential

(2001)

Authors:

E Hodby, G Hechenblaikner, SA Hopkins, OM Maragò, CJ Foot
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Direct observation of irrotational flow and evidence of superfluidity in a rotating Bose-Einstein condensate

(2001)

Authors:

G Hechenblaikner, E Hodby, SA Hopkins, OM Marago', CJ Foot
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Calculation of mode coupling for quadrupole excitations in a Bose-Einstein condensate

(2001)

Authors:

G Hechenblaikner, SA Morgan, E Hodby, OM Marago, CJ 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 American Physical Society (APS) 86:18 (2001) 3938-3941

Authors:

Onofrio Maragò, Gerald Hechenblaikner, Eleanor Hodby, Christopher Foot
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Experimental observation of Beliaev coupling in a Bose-Einstein condensate.

Phys Rev Lett 86:11 (2001) 2196-2199

Authors:

E Hodby, OM Maragò, G Hechenblaikner, CJ Foot

Abstract:

We report the first experimental observation of Beliaev coupling between collective excitations of a Bose-Einstein condensed gas. Beliaev coupling is not predicted by the Gross-Pitaevskii equation and so this experiment tests condensate theory beyond the mean field approximation. Measurements of the amplitude of a high frequency scissors mode show that the Beliaev process transfers energy to a lower-lying mode and then back and forth between these modes, unlike Landau processes which lead to a monotonic decrease in amplitude. To enhance the Beliaev process we adjusted the geometry of the magnetic trapping potential to give a frequency ratio of 2 to 1 between the two scissors modes.
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