Spontaneous deformation of the Fermi surface due to strong correlation in the two-dimensional t-J model

被引：44

作者：

Himeda, A ^{[1
]}

Ogata, M ^{[1
]}

机构：

[1] Univ Tokyo, Grad Sch Arts & Sci, Dept Basic Sci, Meguro Ku, Tokyo 1538902, Japan

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.85.4345

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Fermi surface of the two-dimensional t-J model is studied using the variational Monte Carlo method. We study the Gutzwiller-projected d-wave superconducting state with an additional variational parameter t'(nu) corresponding to the next-nearest-neighbor hopping term. It is found that the finite t'(nu) < 0 gives the lowest variational energy in the wide range of hole-doping rates. The obtained momentum distribution function shows that the Fermi surface deforms spontaneously. It is also shown that the Van Hove singularity is always located very close to the Fermi energy. Using the Gutzwiller approximation, we show that this deformation is due to the Gutzwiller projection operator or the strong correlation.

引用

页码：4345 / 4348

页数：4

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