Mott transition in the one-dimensional SU(n) Hubbard model -: art. no. 205108

被引：17
|
作者：
Szirmai, E [1 ]
Sólyom, J [1 ]
机构：
[1] Res Inst Solid State Phys & Opt, H-1525 Budapest, Hungary
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 20期
关键词：
D O I：
10.1103/PhysRevB.71.205108
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The one-dimensional SU(n) Hubbard model is investigated using an analytical, perturbative renormalization-group treatment in the fermionic formulation of the model for n > 2. It is found that in the half-filled case, the umklapp processes couple the spin and charge degrees of freedom and generate a finite gap for arbitrary finite positive U. This behavior is thus different from that at 1/n filling, where there is one particle per site, in which case the dynamics of the two degrees of freedom can be separated and a critical U-c is needed for the Mott transition.
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页数：7
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