Ultracold atoms in an optical lattice with dynamically variable periodicity

Details Ultracold atoms in an optical lattice with dynamically variable periodicity Ultracold atoms in an optical lattice with dynamically variable periodicity

2010-05-26

arxiv.org/abs/1005.4816v2

Phys. Rev. A 82, 021604(R) (2010)

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures. Minor changes made and references updated

Scientific paper

10.1103/PhysRevA.82.021604

The use of a dynamic "accordion" lattice with ultracold atoms is demonstrated. Ultracold atoms of $^{87}$Rb are trapped in a two-dimensional optical lattice, and the spacing of the lattice is then increased in both directions from 2.2 to 5.5 microns. Atoms remain bound for expansion times as short as a few milliseconds, and the experimentally measured minimum ramp time is found to agree well with numerical calculations. This technique allows an experiment such as quantum simulations to be performed with a lattice spacing smaller than the resolution limit of the imaging system, while allowing imaging of the atoms at individual lattice sites by subsequent expansion of the optical lattice.

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