Coherence length for a trapped Bose gas

S M Barnert, S Franke-Arnold, A S Arnold, C Baxter, Aidan Arnold

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Matter waves can be assigned a coherence length analogous to the corresponding quantity in optics. We show that there is a dramatic increase in coherence length associated with the appearance of Bose-Einstein condensation in a trapped ideal Bose gas. The large increase in coherence length occurs even for temperatures just below the critical temperature at which only a small proportion of the trapped atoms is to be found in the ground state.

Original languageEnglish
Pages (from-to)4177-4191
Number of pages15
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number19
Publication statusPublished - 14 Oct 2000


  • einstein condensation
  • quantum state
  • matter
  • atom
  • coherence length

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