NUMERICAL STUDY OF THE 2-DIMENSIONAL HUBBARD-MODEL FOR VARIOUS BAND FILLINGS

被引:176
作者
MOREO, A
SCALAPINO, DJ
SUGAR, RL
WHITE, SR
BICKERS, NE
机构
[1] UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106
[2] UNIV SO CALIF,DEPT PHYS,LOS ANGELES,CA 90089
来源
PHYSICAL REVIEW B | 1990年 / 41卷 / 04期
关键词
D O I
10.1103/PhysRevB.41.2313
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Quantum Monte Carlo methods are used to study the physical properties of the two-dimensional Hubbard model for various band fillings. Results for the energy, magnetic moment, magnetic structure factor, and integrated optical spectral weight are presented. A comparison of the half-filled (n=1) and quarter-filled (n=0.5) bands is made using results for the momentum distribution nk, the compressibility K, and the one-electron self-energy (k,in), which shows that a gap exists in the one-electron excitations at half-filling but is absent for the one-quarter-filled case. At a filling of n=0.87, the locus of k values for which nk=0.5 is found to be close to the free Fermi surface for this filling. © 1990 The American Physical Society.
引用
收藏
页码:2313 / 2320
页数:8
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