Anisotropic Expansion of Finite Temperature Bose Gases — Emergence of Interaction Effects Between Condensed and Non-Condensed Atoms

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We present calculations that reveal an anisotropic expansion of the non-condensed component in Na clouds cooled below the critical temperature for Bose-Einstein condensation and subsequently released from the asymmetric magnetic trapping potential. Each atomic cloud is composed of a central condensate and a more extended distribution of non-condensed “thermal” atoms. The interaction between the condensed and non-condensed components of the cloud is found to influence their rates of expansion. The noncondensed component is accelerated and the condensed component is decelerated due to the repulsive interaction between the atoms, with the largest effects occuring in the tightly confined direction of the asymmetric trap.