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APS » Journals » Phys. Rev. Lett. » Volume 100 » Issue 9
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Phys. Rev. Lett. 100, 090402 (2008) [4 pages]

Yang-Yang Thermodynamics on an Atom Chip

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A. H. van Amerongen1, J. J. P. van Es1, P. Wicke1, K. V. Kheruntsyan2, and N. J. van Druten1
1Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65-67, 1018 XE Amsterdam, The Netherlands
2ARC Centre of Excellence for Quantum-Atom Optics, School of Physical Sciences, University of Queensland, Brisbane, Queensland 4072, Australia

Received 12 September 2007; revised 24 January 2008; published 3 March 2008

We investigate the behavior of a weakly interacting nearly one-dimensional trapped Bose gas at finite temperature. We perform in situ measurements of spatial density profiles and show that they are very well described by a model based on exact solutions obtained using the Yang-Yang thermodynamic formalism, in a regime where other, approximate theoretical approaches fail. We use Bose-gas focusing [ I. Shvarchuck et al. Phys. Rev. Lett. 89 270404 (2002)] to probe the axial momentum distribution of the gas and find good agreement with the in situ results.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.090402
DOI:
10.1103/PhysRevLett.100.090402
PACS:
05.30.Jp, 03.75.Hh, 05.70.Ce
 
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