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arXiv 0903.4058cond-mat.str-el
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相互作用对光晶格中玻色-爱因斯坦凝聚体Wannier函数的影响及其对玻色-哈伯德模型的意义

Interaction Effects on Wannier Functions of a Bose-Einstein Condensate in an Optical Lattice and Implications for Bose-Hubbard Model

Z. X. Liang, B. B. Hu, Biao Wu

摘要:

我们证明了在光晶格中,人们可以适当地考虑相互作用效应,构造一组玻色-爱因斯坦凝聚体的正交Wannier函数。利用这些相互作用相关的Wannier函数计算了玻色-哈伯德模型中的隧穿速率$J$和在位排斥$U$。这两个参数被发现是与单粒子Wannier函数计算的有很大的不同。我们的数值计算结果$U$被发现在最近的实验中与测量的现场能量很好地吻合[Campbell { \it et al.} Science { \bf 314},281(2006)]。

英文摘要:

We show that one can properly take into account of the interaction effects and construct a set of orthonormal Wannier functions for a Bose-Einstein condensate in an optical lattice. These interaction-dependent Wannier functions are used to compute the tunneling rate $J$ and the on-site repulsion $U$ in the Bose-Hubbard model. Both parameters are found to be substantially different from ones calculated with the single-particle Wannier functions. Our numerical results of $U$ are found in good agreement with the measured on-site energy in a recent experiment [Campbell {\it et al.} Science {\bf 314}, 281 (2006)].

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