Bound States and Universality in Layers of Cold Polar Molecules

Details Bound States and Universality in Layers of Cold Polar Molecules Bound States and Universality in Layers of Cold Polar Molecules

2010-03-30

arxiv.org/abs/1003.5873v2

Europhysics Letters 91, 16001 (2010)

Physics

Condensed Matter

Quantum Gases

6 pages, 5 figures. Revised version to be published

Scientific paper

10.1209/0295-5075/91/16001

The recent experimental realization of cold polar molecules in the rotational and vibrational ground state opens the door to the study of a wealth of phenomena involving long-range interactions. By applying an optical lattice to a gas of cold polar molecules one can create a layered system of planar traps. Due to the long-range dipole-dipole interaction one expects a rich structure of bound complexes in this geometry. We study the bilayer case and determine the two-body bound state properties as a function of the interaction strength. The results clearly show that a least one bound state will always be present in the system. In addition, bound states at zero energy show universal behavior and extend to very large radii. These results suggest that non-trivial bound complexes of more than two particles are likely in the bilayer and in more complicated chain structures in multi-layer systems.

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