Generalized moments expansion applied to the two-dimensional S=1/2 Heisenberg model -: art. no. 214405

被引：9

作者：

Mancini, JD

Murawski, RK

Fessatidis, V

Bowen, SP

机构：

[1] CUNY, Kingsborough Coll, Dept Phys Sci, Brooklyn, NY 11235 USA

[2] Texas A&M Univ, Inst Quantum Studies, College Stn, TX 77843 USA

[3] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

[4] Fordham Univ, Dept Phys, Bronx, NY 10458 USA

[5] Chicago State Univ, Dept Chem & Phys, Chicago, IL 60628 USA

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.72.214405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work we derive a generalized moments expansion (GMX), to third order, of which the well-established connected moments expansion and the alternate moments expansion are shown to be special cases. We discuss the benefits of the GMX with respect to the avoidance of singularities which are known to plague such moments methods. We then apply the GMX estimates for the ground-state energy for the two-dimensional S=1/2 Heisenberg square lattice and compare these results to those of both spin-wave theory and the linked-cluster expansion.

引用

页数：6

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