Expansion of a quantum gas released from an optical lattice

Details Expansion of a quantum gas released from an optical lattice Expansion of a quantum gas released from an optical lattice

2008-08-15

arxiv.org/abs/0808.2212v1

Phys. Rev. Lett. 101, 155303 (2008)

Physics

Condensed Matter

Other Condensed Matter

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.155303

We analyze the interference pattern produced by ultracold atoms released from an optical lattice. Such interference patterns are commonly interpreted as the momentum distributions of the trapped quantum gas. We show that for finite time-of-flights 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.

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