Few-body bound state stability of dipolar molecules in two dimensions

Details Few-body bound state stability of dipolar molecules in two dimensions Few-body bound state stability of dipolar molecules in two dimensions

2011-09-21

arxiv.org/abs/1109.4602v2

Phys. Rev. A 85, 023609 (2012)

Physics

Condensed Matter

Quantum Gases

5 pages, 4 figures, final version

Scientific paper

10.1103/PhysRevA.85.023609

Bound structures among dipolar molecules in multilayers are a topic of great interest in the light of recent experiments that have demonstrated the feasibility of the setup. While it is known that two molecules in two adjacent layers will always bind, larger complexes have only been scarcely addressed thus far. Here we prove rigorously that three- and four-body states will never be bound when the dipoles are oriented perpendicular to the layers. The technique employed is general and can be used for more molecules/layers and other geometries. Our analytical findings are supported by numerical calculations for both fermionic and bosonic molecules. Furthermore, we calculate the reduction in intralayer repulsion necessary to bind large complexes and estimate the influence of bound complexes in systems with many layers.

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