EXACT GROUND-STATES FOR THE HUBBARD-MODEL ON THE KAGOME LATTICE

EXACT GROUND-STATES FOR THE HUBBARD-MODEL ON THE KAGOME LATTICE
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DOI:
10.1088/0305-4470/25/16/011
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发表时间:
1992-08-21
期刊:
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
影响因子:
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通讯作者:
MIELKE, A
MIELKE, A
中科院分区:
其他
文献类型:
--
作者:
MIELKE, A

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我们对 Kagome 晶格上电子密度 n 大于或等于 5/3 且 U > 0 的哈伯德模型的基态给出了完整而严格的描述。如果 11/6 > n 大于或等于 5/3,则系统在零温度下表现出铁磁行为。如果 n 高于 11/6,则系统是顺磁性的。这些结果的证明使用了一些图论方法。结果适用于所有平面格子的线图,其中 Kagome 格子就是一个例子。
We give a complete and rigorous description of the ground states of the Hubbard model on the Kagome lattice for electron densities n greater-than-or-equal-to 5/3 and U > 0. If 11/6 > n greater-than-or-equal-to 5/3 the system shows a ferromagnetic behaviour at zero temperature. If n is above 11/6 the system is paramagnetic. The proof of these results uses some graph-theoretic methods. The results are applicable to all line graphs of planar lattices, of which the Kagome lattice is an example.