PLAQUETTE EXPANSION OF THE 2-DIMENSIONAL ANTIFERROMAGNETIC HEISENBERG-MODEL

被引：6

作者：

TOMLINSON, MJ

HOLLENBERG, LCL

机构：

[1] School of Physics, University of Melbourne, Parkville

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.50.1275

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The plaquette expansion of the Lanczos recursion method is applied to the two-dimensional antiferromagnetic Heisenberg model. Connected Hamiltonian moments [H(n)]c are calculated with respect to the Neel state up to n = 6. The subsequent plaquette expansion of the Lanczos matrix in the number of plaquettes on the lattice, N(p), is determined to order 1/N(p). Diagonalizing the Lanczos matrix in this form gives a value of the energy density of -0.664 in the limit N(p) --> infinity, in good agreement with existing calculations.

引用

页码：1275 / 1277

页数：3