Charge ordering in the one-dimensional extended Hubbard model: Implication to the TMTTF family of organic conductors

被引:49
作者
Shibata, Y [1 ]
Nishimoto, S
Ohta, Y
机构
[1] Chiba Univ, Grad Sch Sci & Technol, Chiba 2638522, Japan
[2] Chiba Univ, Dept Phys, Chiba 2638522, Japan
关键词
D O I
10.1103/PhysRevB.64.235107
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study the charge ordering (CO) in the one-dimensional (1D) extended Hubbard model at quarter filling where the nearest-neighbor Coulomb repulsion and dimerization in the hopping parameters are included. Using the cluster mean-field approximation to take into account the effect of quantum fluctuations, we determine the CO phase boundary of the model in the parameter space at T=0 K. We thus find that the dimerization suppresses the stability of the CO phase strongly, and in consequence, the realistic parameter values for quasi-1D organic materials such as (TMTTF)(2)PF6 are outside the region of CO. We suggest that the long-range Coulomb interaction between the chains should persist to stabilize the CO phase.
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页数:5
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