Spontaneous plaquette formation in the SU(4) spin-orbital ladder

被引：47

作者：

van den Bossche, M ^{[1
]}

Azaria, P

Lecheminant, P

Mila, F

机构：

[1] Univ Toulouse 3, Phys Quant Lab, F-31062 Toulouse 04, France

[2] Univ Paris 06, Phys Theor Liquides Lab, F-75252 Paris 05, France

[3] Univ Cergy Pontoise, Lab Phys Theor & Modelisat, F-95301 Cergy Pontoise, France

[4] Univ Lausanne, Inst Phys Theor, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.86.4124

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The low-energy properties of the SU(4) spin-orbital model on a two-leg ladder are studied by a variety of analytical and numerical techniques. As in the case of SU(2) models, there is a singlet-multiplet gap in the spectrum, but the ground state is twofold degenerate. An interpretation in terms of SU(4)-singlet plaquettes is proposed. The implications for general two-dimensional lattices are outlined.

引用

页码：4124 / 4127

页数：4

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