Quantum phase transition in a Heisenberg antiferromagnet on a square lattice with strong plaquette interactions

被引：29

作者：

Albuquerque, A. Fabricio ^{[1
]}

Troyer, Matthias ^{[2
]}

Oitmaa, Jaan ^{[1
]}

机构：

[1] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

[2] Swiss Fed Inst Technol, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 13期

基金：

澳大利亚研究理事会;

关键词：

D O I：

10.1103/PhysRevB.78.132402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present numerical results for an S=1/2 Heisenberg antiferromagnet on an inhomogeneous square lattice with tunable interaction between spins belonging to different plaquettes. Employing quantum Monte Carlo, we significantly improve on previous results for the critical point separating singlet-disordered and Neel-ordered phases and obtain an estimate for the critical exponent nu consistent with the three-dimensional classical Heisenberg universality class. Additionally, we show that a fairly accurate result for the critical point can be obtained from a contractor renormalization expansion by applying a surprisingly simple analysis to the effective Hamiltonian.

引用

页数：4

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