Two-Dimensional Dynamics of Ultracold Atoms in Optical Lattices

Details Two-Dimensional Dynamics of Ultracold Atoms in Optical Lattices Two-Dimensional Dynamics of Ultracold Atoms in Optical Lattices

2007-07-05

arxiv.org/abs/0707.0870v2

Phys. Rev. A 76, 051603(R) (2007)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 6 figures; references added; improved figures

Scientific paper

10.1103/PhysRevA.76.051603

We analyze the dynamics of ultracold atoms in optical lattices induced by a sudden shift of the underlying harmonic trapping potential. In order to study the effect of strong interactions, dimensionality and lattice topology on transport properties, we consider bosonic atoms with arbitrarily strong repulsive interactions, on a two-dimensional square lattice and a hexagonal lattice. On the square lattice we find insulating behavior for weakly interacting atoms and slow relaxation for strong interactions, even when a Mott plateau is present, which in one dimension blocks the dynamics. On the hexagonal lattice the center of mass relaxes to the new equilibrium for any interaction strength.

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