APPROXIMATE TREATMENT OF A 2-DIMENSIONAL ANISOTROPIC PEIERLS-HUBBARD MODEL

被引：6

作者：

BERNHARD, BH ^{[1
]}

IGLESIAS, JR ^{[1
]}

机构：

[1] UNIV FED RIO GRANDE SUL,INST FIS,BR-91501 PORTO ALEGRE,RS,BRAZIL

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.47.12408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A Green-function formalism is presented to study a Peierls-Hubbard Hamiltonian in two dimensions. The lattice consists of parallel dimerized chains with alternating nearest-neighbor hoppings t and t(parallel-to) and another hopping t(perpendicular-to) between different chains. The method treats the interdimer hopping as a perturbation and yields exact results in the uncorrelated case and for isolated dimers. The calculated spectral functions exhibit a number of narrow subbands with typical low-dimensional singularities. The dependence of the gap at the Fermi level on the electron-electron interaction U agrees qualitatively with the exact result in the known one-dimensional nondimerized limit. The paramagnetic susceptibility shows a maximum structure at low temperatures that is enhanced by U and by dimerization and a Curie-Weiss behavior at high temperatures.

引用

页码：12408 / 12414

页数：7

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