Spontaneous Formation of Antiferromagnetic Vortex Lattice in a Fast Rotating BEC with Dipole Interactions |
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Authors: | YANG Shi-Jie FENG Shi-Ping WEN Yu-Chuan YU Yue |
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Institution: | 1. Department of Physics, Beijing Normal University, Beijing 100875, China
;2. Interdisciplinary Center of Theoretical Studies,
the Chinese Academy of Sciences, P.O. Box 2735, Beijing 100080, China
;3. Institute of Theoretical Physics, the Chinese Academy of Sciences, P.O. Box 2735, Beijing 100080, China |
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Abstract: | When a Bose-Einstein condensate is set to rotate,superfluid vortices will be formed,which finally condense into a vortex lattice as the rotation frequency further increases.We show that the dipole-dipole interactions renormalize the short-range interaction strength and result in a distinction between interactions of parallel-polarized atoms and interactions of antiparallel-polarized atoms.This effect may lead to a spontaneous breakdown of the rapidly rotating Bose condensate into a novel anti-ferromagnetic-like vortex lattice.The upward-polarized Bose condensate forms a vortex lattice,which is staggered against a downward-polarized vortex lattice.A phase diagram related to the coupling strength is obtained. |
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Keywords: | Bose condensate dipolar interaction vortex lattice |
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