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

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Abstract

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
Volume101
Issue number15
DOIs
StatePublished - Oct 9 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Gerbier, F., Trotzky, S., Fölling, S., Schnorrberger, U., Thompson, J. D., Widera, A., Bloch, I., Pollet, L., Troyer, M., Capogrosso-Sansone, B., Prokof'ev, N. V., & Svistunov, B. V. (2008). Expansion of a quantum gas released from an optical lattice. Physical review letters, 101(15), [155303]. https://doi.org/10.1103/PhysRevLett.101.155303