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arXiv 1003.1541cond-mat.quant-gascond-mat.otherphysics.atom-ph
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光晶格中二维玻色气体的位相

Phases of a 2D Bose Gas in an Optical Lattice

K. Jimenez-Garcia, R. L. Compton, Y. -J. Lin, W. D. Phillips, J. V. Porto, I. B. Spielman

摘要:

光晶格中的超冷原子实现了凝聚态物理中简单的基本模型。我们的~(87)Rb玻色-爱因斯坦凝聚体被限制在一个加了光晶格势的谐波俘获势中。在这里,我们实现了2D玻色哈伯德哈密顿量,并专注于谐波陷阱的影响,不存在于散装凝聚态系统。通过测量凝聚分数,我们确定了从超流到莫特绝缘体的转变是原子密度和晶格深度的函数。我们的结果与Rigol等人(Phys. Rev. A 79,053605(2009))提出的适用于捕获系统的量子Monte Carlo普适态图非常一致。

英文摘要:

Ultra-cold atoms in optical lattices realize simple, fundamental models in condensed matter physics. Our 87Rb Bose-Einstein condensate is confined in a harmonic trapping potential to which we add an optical lattice potential. Here we realize the 2D Bose-Hubbard Hamiltonian and focus on the effects of the harmonic trap, not present in bulk condensed matter systems. By measuring condensate fraction we identify the transition from superfluid to Mott insulator as a function of atom density and lattice depth. Our results are in excellent agreement with the quantum Monte Carlo universal state diagram, suitable for trapped systems, introduced by Rigol et al. (Phys. Rev. A 79, 053605 (2009)).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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