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arXiv 0903.3168cond-mat.str-el
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二维哈伯德模型中的无公度反铁磁涨落

Incommensurate antiferromagnetic fluctuations in the two-dimensional Hubbard model

H. C. Krahl, S. Friederich, C. Wetterich

摘要:

利用泛函重整化群方程研究了二维t-t '-哈伯德模型中的公度和无公度反铁磁涨落.对于一个足够的偏差,从半填充,我们建立的存在下的伪临界温度T_{pc}的本地无公度秩序。在平均场近似中没有考虑的波动是重要的--它们使T_{pc}降低因子\approx 2.5。

英文摘要:

Commensurate and incommensurate antiferromagnetic fluctuations in the two-dimensional repulsive t-t'-Hubbard model are investigated using functional renormalization group equations. For a sufficient deviation from half filling we establish the existence of local incommensurate order below a pseudocritical temperature T_{pc}. Fluctuations not accounted for in the mean field approximation are important--they lower T_{pc} by a factor \approx2.5.

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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