Three-body interactions with cold polar molecules

Details Three-body interactions with cold polar molecules Three-body interactions with cold polar molecules

2007-03-26

arxiv.org/abs/cond-mat/0703688v1

Nature Physics 3, 726 - 731 (2007)

Physics

Condensed Matter

Statistical Mechanics

8 pages, 4 figures

Scientific paper

We show that polar molecules driven by microwave fields give naturally rise to strong three-body interactions, while the two-particle interaction can be independently controlled and even switched off. The derivation of these effective interaction potentials is based on a microscopic understanding of the underlying molecular physics, and follows from a well controlled and systematic expansion into many-body interaction terms. For molecules trapped in an optical lattice, we show that these interaction potentials give rise to Hubbard models with strong nearest-neighbor two-body and three-body interaction. As an illustration, we study the one-dimensional Bose-Hubbard model with dominant three-body interaction and derive its phase diagram.

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