Quantum spin liquid in a spin-1/2 XY model with four-site exchange on the kagome lattice

被引：23

作者：

Dang, Long ^{[1
]}

Inglis, Stephen ^{[1
]}

Melko, Roger G. ^{[1
]}

机构：

[1] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 13期

基金：

加拿大自然科学与工程研究理事会;

关键词：

GROUND-STATE; ANTIFERROMAGNETS;

D O I：

10.1103/PhysRevB.84.132409

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the ground-state phase diagram of a two-dimensional kagome-lattice spin-1/2 XY model (J) with a four-site ring-exchange interaction (K) using quantum Monte Carlo simulations. We find that the superfluid phase, existing in the regime of small ring exchange, undergoes a direct transition to a Z(2) quantum spin liquid phase at (K/J)(c) approximate to 22, which is related to the phase proposed by L. Balents, M. P. A. Fisher, and S. M. Girvin [Phys. Rev. B 65, 224412 (2002)]. The quantum phase transition between the superfluid and the spin liquid phase has exponents z and nu falling in the three-dimensional XY universality class, making it a candidate for an exotic XY* quantum critical point, mediated by the condensation of bosonic spinons.

引用

页数：4

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