One-dimensional SU(4) spin-orbital model: A low-energy effective theory

被引：90

作者：

Azaria, P

Gogolin, AO

Lecheminant, P

Nersesyan, AA

机构：

[1] Univ Paris 06, Phys Theor Liquides Lab, F-75252 Paris, France

[2] Univ London Imperial Coll Sci Technol & Med, Dept Math, London SW7 2BZ, England

[3] Univ Cergy Pontoise, Lab Phys Theor & Modelisat, F-95302 Cergy Pontoise, France

[4] Abdus Salam Int Ctr Theoret Phys, I-34100 Trieste, Italy

[5] Georgian Acad Sci, Inst Phys, GE-380077 Tbilisi, Georgia

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.83.624

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The one-dimensional spin-orbital model is studied by means of Abelian bosonization. We derive the low-energy effective theory which enables us to study small deviations from the SU(4) symmetric point. We show that there exists a massless region with algebraically decaying correlation functions similar to cos[(pi/2a(0))x]x(-3/2). When entering the massive phase, the system displays an approximate SO(6) enlarged symmetry with a dimerization type of ordering consisting in alternating spin and orbital singlets.

引用

页码：624 / 627

页数：4

共 20 条

[1] EXACT CRITICAL EXPONENTS FOR QUANTUM SPIN CHAINS, NONLINEAR SIGMA-MODELS AT THETA=PI AND THE QUANTUM HALL-EFFECT [J].