Rigorous criteria for ferromagnetism in itinerant electron systems.
Rigorous criteria for ferromagnetism in itinerant electron systems.
复制标题
流动电子系统中铁磁性的严格标准。
DOI：
10.1103/physrevlett.72.3425
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发表时间：
1994
影响因子：
8.6
通讯作者：
D. Vollhardt
中科院分区：
文献类型：
--
作者：
R. Strack;D. Vollhardt
我们推导出第一个详细的，严格的标准的稳定性饱和铁磁性在最一般的单带模型的巡回电子，有效的任意几何不变的晶格，在半填充。这些条件由模型参数的不等式给出。在所有的相互作用中，只有现场和交换的相互作用是必不可少的。通过同样的方法，我们也得到了严格的标准饱和铁磁性的稳定性在哈伯德模型与磁场。
We derive the first detailed, rigorous criteria for the stability of saturated ferromagnetism in the most general single-band model of itinerant electrons, valid for arbitrary translationally invariant lattices, at half filling. These conditions are given by inequalities for the model parameters. Of all interactions only the on-site and the exchange interaction are found to be essential. By the same approach we also derive rigorous criteria for the stability of saturated ferromagnetism in the Hubbard model with a magnetic field.