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arXiv 0812.3264cond-mat.stat-mechcond-mat.mes-hall
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一维玻色气体中的动态和静态密度-密度关联:精确结果和近似

Dynamic and static density-density correlations in the one-dimensional Bose gas: exact results and approximations

Alexander Yu. Cherny, Joachim Brand

摘要:

我们讨论了近似公式的一维玻色气体的Lieb-Liniger模型,似乎是适用于广泛的相关参数,如相互作用强度,频率和波数的动态结构因子。建议的近似是一致的,在极限情况下已知的确切结果。特别是,我们包括确切的边缘指数以及Luttinger液体和微扰理论的结果。我们进一步讨论导出的近似的静态结构因子和对分布函数g(x)。近似表达式与基于代数Bethe分析的数值结果吻合良好。

英文摘要:

We discuss approximate formulas for the dynamic structure factor of the one-dimensional Bose gas in the Lieb-Liniger model that appear to be applicable over a wide range of the relevant parameters such as the interaction strength, frequency, and wavenumber. The suggested approximations are consistent with the exact results known in limiting cases. In particular, we encompass exact edge exponents as well as Luttinger liquid and perturbation theoretic results. We further discuss derived approximations for the static structure factor and the pair distribution function g(x). The approximate expressions show excellent agreement with numerical results based on the algebraic Bethe ansatz.

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