Quantum crystals in a trapped Rydberg-dressed Bose-Einstein condensate

Details Quantum crystals in a trapped Rydberg-dressed Bose-Einstein condensate Quantum crystals in a trapped Rydberg-dressed Bose-Einstein condensate

2011-09-26

arxiv.org/abs/1109.5480v2

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures

Scientific paper

Spontaneously crystalline ground states, called quantum crystals, of a trapped Rydberg-dressed Bose-Einstein condensate are numerically investigated. As a result described by a mean-?eld order parameter, such states simultaneously possess crystalline and superfluid properties. A hexagonal droplet lattice is observed in a quasi-two-dimensional system when dressing interaction is sufficiently strong. Onset of these states is characterized by a drastic drop of the non-classical rotational inertia proposed by Leggett [Phys. Rev. Lett. 25, 1543 (1970)]. In addition, an AB stacking bilayer lattice can also be attained. Due to an anisotropic interaction possibly induced by an external electric field, transition from a hexagonal to a nearly square droplet lattice is also observed.

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