OBSERVABILITY OF BETHE-ANSATZ EXCITATIONS IN HEISENBERG-ISING SPIN SYSTEMS

被引：6

作者：

FOWLER, M

PUGA, MW

机构：

[1] Department of Physics, University of Virginia, Charlottesville

来源：

PHYSICAL REVIEW B | 1979年 / 19卷 / 11期

关键词：

D O I：

10.1103/PhysRevB.19.5906

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Hohenberg-Brinkman sum rule analysis is extended to Heisenberg-Ising chains of arbitrary anisotropy in uniform magnetic fields. It is found that when the system is gapless, Bethe-ansatz excitations dominate the weight function χzz′′(k,ω) at low k. They do not in general dominate χxx′′. When the excitation spectrum has a small gap, the mean energy of χzz′′(0,ω) is far larger than the gap energy single excitations no longer dominate, although they again become important as the gap gets very large. © 1979 The American Physical Society.

引用

页码：5906 / 5913

页数：8