Two-dimensional quantum XY model with ring exchange and external field -: art. no. 100408

被引：38

作者：

Melko, RG ^{[1
]}

Sandvik, AW

Scalapino, DJ

机构：

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

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

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.69.100408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present the zero-temperature phase diagram of a square lattice quantum spin-1/2 XY model with four-site ring exchange in a uniform external magnetic field. Using quantum Monte Carlo techniques, we identify various quantum phase transitions between the XY order, striped or valence bond solid, staggered Neel antiferromagnet and fully polarized ground states of the model. We find no evidence for a quantum spin liquid phase.

引用

页数：4

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