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arXiv 0906.3446cond-mat.stat-mechcond-mat.quant-gas
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Lieb-Liniger模型中动力结构因子的近似表达式

Approximate expression for the dynamic structure factor in the Lieb-Liniger model

Alexander Yu. Cherny, Joachim Brand

摘要:

最近,Imambekov和Glazman [Phys. Rev. Lett. 100,206805(2008)]表明,一维玻色气体的动态结构因子(DSF)沿集体模的极限色散曲线表现出幂律行为,并精确计算了相应的指数。结合这些最近的结果与以前得到的强耦合展开,我们提出了一个插值公式的DSF的一维玻色气体。得到的表达式与Luttinger液体理论的精确低能指数进一步一致,并与最近的数值结果吻合良好。

英文摘要:

Recently, Imambekov and Glazman [Phys. Rev. Lett. 100, 206805 (2008)] showed that the dynamic structure factor (DSF) of the 1D Bose gas demonstrates power-law behaviour along the limiting dispersion curve of the collective modes and calculated the corresponding exponents exactly. Combining these recent results with a previously obtained strong-coupling expansion we present an interpolation formula for the DSF of the 1D Bose gas. The obtained expression is further consistent with exact low energy exponents from Luttinger liquid theory and shows nice agreement with recent numerical results.

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