Expansion of a quantum gas released from an optical lattice.

We analyze the interference pattern produced by ultracold atoms released from an optical lattice, commonly interpreted as the momentum distributions of the trapped quantum gas. We show that for finite times of flight the resulting density distribution can, however, be significantly altered, similar to a near-field diffraction regime in optics. We illustrate our findings with a simple model and realistic quantum Monte Carlo simulations for bosonic atoms and compare the latter to experiments.

• Publication year

  2008

• Venue

  Physical Review Letters

• Publication date

  2008-08-15

• Fields of study

  Medicine, Physics

• Identifiers
  DOI 10.1103/PhysRevLett.101.155303arXiv 0808.2212PMID 18999609
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

• PhD thesis

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