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Structural Phase Transitions of Vortex Matter in an Optical Lattice

Structural Phase Transitions of Vortex Matter in an Optical Lattice

We consider the vortex structure of a rapidly rotating trapped atomic Bose-Einstein condensate in the presence of a corotating periodic optical lattice potential. We observe a rich variety of structural phases which reflect the interplay of the vortex-vortex and vortex-lattice interactions. The lattice structure is very sensitive to the ratio …