Ultracold quantum matter

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Dynamic Manipulation of Bose-Einstein Condensates With a Spatial Light Modulator

(2005)

Authors:

V Boyer, RM Godun, G Smirne, D Cassettari, CM Chandrashekar, AB Deb, ZJ Laczik, CJ Foot
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Research in Atomic, Ionic and Photonic Systems for Scalable Deterministic Quantum Logic

(2005)

Authors:

K Banaszek, CJ Foot, D Lucas, DN Stacey, A Steane, IA Walmsley
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Realisation of a Frequency Standard Using an Atomic Fountain

(2005)

Authors:

A Michaud, M Chowdhury, KP Zetie, CJ Cooper, G Hillenbrand, V Lorent, A Steane, CJ Foot
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Quasi-2D confinement of a BEC in a combined optical and magnetic potential

Journal of Physics B: Atomic, Molecular and Optical Physics 38:3 (2005) 223-235

Authors:

NL Smith, WH Heathcote, G Hechenblaikner, E Nugent, CJ Foot

Abstract:

We have added an optical potential to a conventional time-averaged orbiting potential (TOP) trap to create a highly anisotropic hybrid trap for ultracold atoms. Axial confinement is provided by the optical potential; the maximum frequency currently obtainable in this direction is 2.2 kHz for rubidium. The radial confinement is independently controlled by the magnetic trap and can be a factor of 700 times smaller than in the axial direction. This large anisotropy is more than sufficient to confine condensates with ∼105 atoms in a quasi-2D (Q2D) regime, and we have verified this by measuring a change in the free expansion of the condensate; our results agree with a variational model. © 2005 IOP Publishing Ltd.
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Properties of quasi-two-dimensional condensates in highly anisotropic traps

Physical Review A - Atomic, Molecular, and Optical Physics 71:1 (2005)

Authors:

G Hechenblaikner, JM Krueger, CJ Foot

Abstract:

We theoretically investigate some of the observable properties of quasi-two-dimensional condensates. Using a variational model based on a Gaussian-parabolic trial wave function we calculate chemical potential, condensate size in time-of-flight, release energy, and collective excitation spectrum for varying trap geometries and atom numbers and find good agreement with recent published experimental results. © 2005 The American Physical Society.
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