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Applied Physics B

, Volume 73, Issue 8, pp 781–789 | Cite as

Phase fluctuations in Bose–Einstein condensates

  • D. Hellweg
  • S. Dettmer
  • P. Ryytty
  • J.J. Arlt
  • W. Ertmer
  • K. Sengstock
  • D.S. Petrov
  • G.V. Shlyapnikov
  • H. Kreutzmann
  • L. Santos
  • M. Lewenstein
Article

Abstract.

We demonstrate the existence of phase fluctuations in elongated Bose–Einstein condensates (BECs) and study the dependence of these fluctuations on the system parameters. A strong dependence on temperature, atom number, and trapping geometry is observed. Phase fluctuations directly affect the coherence properties of BECs. In particular, we observe instances where the phase-coherence length is significantly smaller than the condensate size. Our method of detecting phase fluctuations is based on their transformation into density modulations after ballistic expansion. An analytic theory describing this transformation is developed.

PACS: 03.75.Fi; 32.80.Pj; 05.30.Jp 

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • D. Hellweg
    • 1
  • S. Dettmer
    • 1
  • P. Ryytty
    • 1
  • J.J. Arlt
    • 1
  • W. Ertmer
    • 1
  • K. Sengstock
    • 1
  • D.S. Petrov
    • 2
  • G.V. Shlyapnikov
    • 2
  • H. Kreutzmann
    • 3
  • L. Santos
    • 3
  • M. Lewenstein
    • 3
  1. 1.Institut für Quantenoptik, Universität Hannover, Welfengarten 1, 30167 Hannover, GermanyGermany
  2. 2.FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The NetherlandsThe Netherlands
  3. 3.Institut für Theoretische Physik, Universität Hannover, Appelstrasse 2, 30167 Hannover, GermanyGermany

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