Low-density ferromagnetism in the Hubbard model

被引：0
|
作者：
An, J [1 ]
Gong, CD
机构：
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
[3] China Ctr Adv Sci & Technol, World Lab, Beijing 100080, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2001年 / 18卷 / 01期
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D O I：
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中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study analytically the stability of the saturated ferromagnetic ground state (the Nagaoka state) of the Hubbard model in the low electron density limit with the mean-field approach. We find that the critical U-c is just 4 pit, where t is the hopping integral between the nearest neighbours, i.e., when U is larger than 4 pit, the paramagnetic state is unstable with respect to the ferromagnetic state, and vice verse.
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页码：109 / 110
页数：2
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