QUARTET STATE OF THE 2-DIMENSIONAL HEISENBERG-MODEL WITH THE SPIN-1/2 ON A SQUARE LATTICE

被引：1

作者：

BELINICHER, VI ^{[1
]}

POPOVICH, LV ^{[1
]}

机构：

[1] NOVOSIBIRSK INORGAN CHEM INST,NOVOSIBIRSK 630090,RUSSIA

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 1994年 / 8卷 / 16期

关键词：

D O I：

10.1142/S0217979294000890

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The low-energy properties of the two-dimensional Heisenberg model with spin-1/2 on a square lattice are investigated on the basis of the local dimer order. The lattice is divided into square blocks consisting of the quarters of spins. The spin variables and the Heisenberg Hamiltonian are expressed in terms of the low-energy quartet variables. On the basis of the Dyson-Maleev representation, the spin-wave theory of the quartet state is developed. The spectrum of the lower magnon excitations consists of three degenerate modes with the energy gap DELTA = 0.17J. The ground state energy per spin E/N = -0.6J. Calculations of the basic corrections make the work complete.

引用

页码：2203 / 2219

页数：17

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