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Coherence length for a trapped Bose gas

Barnert, S M and Franke-Arnold, S and Arnold, A S and Baxter, C and Arnold, Aidan (2000) Coherence length for a trapped Bose gas. Journal of Physics B: Atomic, Molecular and Optical Physics, 33 (19). pp. 4177-4191. ISSN 0953-4075

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Abstract

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.