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Effective mass divergence in the infinite-U Hubbard model

机译:无限U Hubbard模型中的有效质量散度

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To clarify the property of Mott transition in the strong correlation limit. we investigate the infinite-U Hubbard model using high-temperature expansion method. The free energies in various lattices are obtained Lis a function of inverse temperature and electron density. If we assume the low temperature behavior as S proportional to T, we can extrapolate the series down to T = 0 with remarkable accuracy and find that the specific heat coefficient y diverges with n -> 1. Furthermore. it is revealed that the divergence is scaled as y proportional to (1 - n)(-x) with x similar to 1.7-1.8, which is almost irrespective of lattice structure. (c) 2006 Elsevier B.V. All rights reserved.
机译:为了阐明强相关极限中Mott跃迁的性质。我们使用高温膨胀法研究无限U Hubbard模型。获得了各种晶格中的自由能,这是反温度和电子密度的函数。如果我们将低温行为假定为与T成正比的S,则可以以极高的精度将序列向下外推到T = 0,并且发现比热系数y在n-> 1时发散。结果表明,发散度按比例与(1-n)(-x)成比例的y缩放,x类似于1.7-1.8,这几乎与晶格结构无关。 (c)2006 Elsevier B.V.保留所有权利。

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