VARIATIONAL MONTE-CARLO STUDY OF THE SPIRAL STATE IN THE HUBBARD-MODEL

被引:2
|
作者
LIU, YJ
DONG, JM
GONG, CD
CHEN, TY
机构
[1] CHINESE CTR ADV SCI & TECHNOL,WORLD LAB,CTR THEORET PHYS,BEIJING,PEOPLES R CHINA
[2] NANJING UNIV,NATL LAB SOLID STATE MICROSTRUCT,NANJING 210008,PEOPLES R CHINA
来源
PHYSICAL REVIEW B | 1993年 / 48卷 / 02期
关键词
D O I
10.1103/PhysRevB.48.1306
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Choosing the Gutzwiller-type variational wave function and using the variational Monte Carlo (VMC) method, we have calculated the ground-state energies of two-dimensional (2D) Hubbard squares at temperature T = 0 and have obtained the phase diagram in the small doping region (delta = 0-0.15). We do not find the spiral phase until at least U almost-equal-to 20 in the half-filled and dilute-doping cases. This is different from the results obtained by C. Jayaprakash et al., who calculated the phase diagram of the 2D t-J model at temperature T = 0 with the slave-fermion mean-field theory and found the spiral phase at much lower values of U/t.
引用
收藏
页码:1306 / 1309
页数:4
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