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
收藏
页码：1949 / 1957
页数：9
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