EXACT-SOLUTIONS OF FRUSTRATED ORDINARY AND CHIRAL 8-SITE HUBBARD MODELS

被引:13
作者
FREERICKS, JK [1 ]
FALICOV, LM [1 ]
ROKHSAR, DS [1 ]
机构
[1] UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA
来源
PHYSICAL REVIEW B | 1991年 / 44卷 / 04期
关键词
D O I
10.1103/PhysRevB.44.1458
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This contribution addresses the question of whether or not the ground state of a frustrated spin-1/2 Heisenberg model can be smoothly related to the ground state of a simple tight-binding model at half-filling in an appropriately chosen magnetic field. This continuity is considered explicitly for an eight-site square-lattice Hubbard model with nearest- and next-nearest-neighbor hopping, which approaches a frustrated Heisenberg model with nearest- and next-nearest-neighbor antiferromagnetic exchange coupling in the limit of large Hubbard U. In addition, a counterexample to the widely held belief that the half-filled band of the ordinary Hubbard model is nonmagnetic has been found in the regime where the hopping parameters and Hubbard interaction are all the same order of magnitude.
引用
收藏
页码:1458 / 1474
页数:17
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