Mapping out the quasi-condensate transition through the 1D-3D dimensional crossover

Details Mapping out the quasi-condensate transition through the 1D-3D dimensional crossover Mapping out the quasi-condensate transition through the 1D-3D dimensional crossover

2010-11-16

arxiv.org/abs/1011.3631v2

Physical Review A: Atomic, Molecular and Optical Physics (2011) vol. 83, p. 021605

Physics

Condensed Matter

Quantum Gases

Scientific paper

By measuring the density fluctuations in a highly elongated weakly interacting Bose gas, we observe and quantify the transition from the ideal gas to a quasi-condensate regime throughout the dimensional crossover from a purely 1D to an almost 3D gas. We show that that the entire transition region and the dimensional crossover are described surprisingly well by the modified Yang-Yang model. Furthermore, we find that at low temperatures the linear density at the quasi-condensate transition scales according to an interaction-driven scenario of a longitudinally uniform 1D Bose gas, whereas at high temperatures it scales according to the degeneracy-driven critical scenario of transverse condensation of a 3D ideal gas.

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