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Phase fluctuations in Bose–Einstein condensates

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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.

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Authors and Affiliations

  1. Institut für Quantenoptik, Universität Hannover, Welfengarten 1, 30167 Hannover, Germany, Germany

    D. Hellweg, S. Dettmer, P. Ryytty, J.J. Arlt, W. Ertmer & K. Sengstock

  2. FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands, The Netherlands

    D.S. Petrov & G.V. Shlyapnikov

  3. Institut für Theoretische Physik, Universität Hannover, Appelstrasse 2, 30167 Hannover, Germany, Germany

    H. Kreutzmann, L. Santos & M. Lewenstein

Authors
  1. D. Hellweg
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  2. S. Dettmer
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  3. P. Ryytty
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  4. J.J. Arlt
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  5. W. Ertmer
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  6. K. Sengstock
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  7. D.S. Petrov
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  8. G.V. Shlyapnikov
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  9. H. Kreutzmann
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  10. L. Santos
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  11. M. Lewenstein
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Additional information

Received: 13 July 2001 / Revised version: 28 September 2001 / Published online: 23 November 2001

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Hellweg, D., Dettmer, S., Ryytty, P. et al. Phase fluctuations in Bose–Einstein condensates. Appl Phys B 73, 781–789 (2001). https://doi.org/10.1007/s003400100747

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  • DOI: https://doi.org/10.1007/s003400100747

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