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arXiv 0911.3596cond-mat.str-el
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高阻挫一维晶格上哈伯德模型的低温性质

Low-temperature properties of the Hubbard model on highly frustrated one-dimensional lattices

O. Derzhko, J. Richter, A. Honecker, M. Maksymenko, R. Moessner

摘要:

我们考虑了三个高阻挫一维晶格--我们构造了{ \em精确多电子}基态在低电子填充下的完备流形,并计算了这些态的简并度。结果,我们得到了封闭形式的表达式为低温热力学量周围的化学势$μ_0$的特定值。我们讨论了这些基态合奏,如剩余熵,一个额外的低温峰的比热,铁磁性和顺磁性的存在下的热力学量的具体功能。我们确认我们的分析结果与有限系统的精确对角化数据进行比较。

英文摘要:

We consider the repulsive Hubbard model on three highly frustrated one-dimensional lattices -- sawtooth chain and two kagomé chains -- with completely dispersionless (flat) lowest single-electron bands. We construct the complete manifold of {\em exact many-electron} ground states at low electron fillings and calculate the degeneracy of these states. As a result, we obtain closed-form expressions for low-temperature thermodynamic quantities around a particular value of the chemical potential $μ_0$. We discuss specific features of thermodynamic quantities of these ground-state ensembles such as residual entropy, an extra low-temperature peak in the specific heat, and the existence of ferromagnetism and paramagnetism. We confirm our analytical results by comparison with exact diagonalization data for finite systems.

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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