SOLITONIC EXCITATIONS IN THE HALDANE PHASE OF AN S=1 CHAIN

被引：52

作者：

FATH, G

SOLYOM, J

机构：

[1] Res. Inst. for Solid State Phys., Budapest

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1993年 / 5卷 / 48期

关键词：

D O I：

10.1088/0953-8984/5/48/009

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We study low-lying excitations in the 1D S = 1 antiferromagnetic valence-bond-solid (vbs) model. In a numerical calculation on finite systems the lowest excitations are found to form a discrete triplet branch, separated from the higher-lying continuum. The dispersion of these triplet excitations can be satisfactorily reproduced by assuming approximate wavefunctions. These wavefunctions are shown to correspond to moving hidden domain walls, i.e. to one-soliton excitations.

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页码：8983 / 8998

页数：16

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