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arXiv 1304.2634cond-mat.quant-gas
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玻色二次超晶格的广义有效势Landau理论

Generalized Effective Potential Landau Theory for Bosonic Quadratic Superlattices

Tao Wang, Xue-Feng Zhang, Sebastian Eggert, Axel Pelster

摘要:

研究了二次光学超晶格的玻色-哈伯德模型的性质。为此,我们将最近建立的单组分有效势Landau理论推广到多组分的情况,不仅找到了分数填充的特征不可压缩固相,而且得到了零温下整个参数区域的量子相图。通过与量子蒙特卡罗模拟结果的比较,验证了广义有效势朗道理论(GEPLT)的高精度.最后,我们评论的优点和缺点的GEPLT鉴于直接比较与相应的解耦平均场论。

英文摘要:

We study the properties of the Bose-Hubbard model for a quadratic optical superlattice. To this end we generalize a recently established effective potential Landau theory for a single component to the case of multi components and find not only the characteristic incompressible solid phases with fractional filling, but also obtain the underlying quantum phase diagram in the whole parameter region at zero temperature. Comparing our analytic results with corresponding ones from quantum Monte Carlo simulations demonstrates the high accuracy of the generalized effective potential Landau theory (GEPLT). Finally, we comment on the advantages and disadvantages of the GEPLT in view of a direct comparison with a corresponding decoupled mean-field theory.

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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