NUMERICAL STUDY OF FLUX PHASES IN THE T-J MODEL

被引：43

作者：

POILBLANC, D ^{[1
]}

HASEGAWA, Y ^{[1
]}

RICE, TM ^{[1
]}

机构：

[1] SWISS FED INST TECHNOL,THEORET PHYS,CH-8093 ZURICH,SWITZERLAND

来源：

PHYSICAL REVIEW B | 1990年 / 41卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.41.1949

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Commensurate flux states for the t-J model are investigated on a finite 4×4 cluster with two holes. Qualitative agreement is found with a renormalized mean-field theory; in particular, the magnetic energy exhibits an absolute minimum when the flux exactly equals the filling. Competition with the kinetic energy favors a smaller commensurate flux at intermediate J/t values. We investigate the effect of a nearest-neighbor hole-hole repulsion V. Comparing the exact ground-state results shows that the V causes an effective reduction in the value of J/t. The commensurate flux phases (CFPs) do not exhibit hole-hole attraction in real space, contrary to the t-J model for J/t0.4. Therefore, the stability of the CFPs would be enhanced by a short-range repulsion between the holes. © 1990 The American Physical Society.

引用

页码：1949 / 1957

页数：9

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