Expansion of a quantum gas released from an optical lattice

F. Gerbier, S. Trotzky, S. Fölling, U. Schnorrberger, J. D. Thompson, A. Widera, I. Bloch, L. Pollet, M. Troyer, B. Capogrosso-Sansone, N. V. Prokof'ev, B. V. Svistunov

Research output: Contribution to journalArticlepeer-review

96 Scopus citations


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.

Original languageEnglish (US)
Article number155303
JournalPhysical review letters
Issue number15
StatePublished - Oct 9 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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