Destruction of interference by many-body interactions in cold atomic Bose gases

Abstract

We study the effects of many-body interactions on the interference in a Mach-Zehnder interferometer for matter waves of ultracold Bose atoms. After switching off an axial trapping potential, the thermal initial wavepacket expands, and subsequently interference fringes may be observed in a circular 1D trap. These are computed for axial harmonic or $\delta$-function traps, and for interaction strengths from the Thomas-Fermi regime to the Tonks-Girardeau limit. It is shown that many-body correlations in a realistic setup destroy interference to a large degree. Analytical expressions allowing to infer the observability of phase coherence and interference are provided.

arXiv comment7 pages, 4 eps figures, final version, to be published in PRA

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• Ground-state properties of few-Boson system in a one-dimensional hard wall potential with split
• Optically guided beam splitter for propagating matter waves
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• One-dimensional fermionic gases with attractive p-wave interaction in a hard-wall trap
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• Nanoscale atomic waveguides with suspended carbon nanotubes
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• Momentum interferences of a freely expanding Bose-Einstein condensate in 1D due to interatomic interaction change
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