Striped phase in a quantum XY model with ring exchange -: art. no. 247201

被引：99

作者：

Sandvik, AW

Daul, S

Singh, RRP

Scalapino, DJ

机构：

[1] Abo Akad Univ, Dept Phys, FIN-20500 Turku, Finland

[2] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[3] Univ Calif Santa Barbara, Inst Theoret Phys, Santa Barbara, CA 93106 USA

[4] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 24期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.89.247201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present quantum Monte Carlo results for a square-lattice S=1/2 XY model with a standard nearest-neighbor coupling J and a four-spin ring exchange term K. Increasing K/J, we find that the ground state spin stiffness vanishes at a critical point at which a spin gap opens and a striped bond-plaquette order emerges. At still higher K/J, this phase becomes unstable and the system develops a staggered magnetization. We discuss the quantum phase transitions between these phases.

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页码：247201 / 247201

页数：4

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