Effective quantum dimer model for the kagome Heisenberg antiferromagnet: Nearby quantum critical point and hidden degeneracy

被引：70

作者：

Poilblanc, Didier ^{[1
]}

Mambrini, Matthieu

Schwandt, David

机构：

[1] CNRS, Phys Theor Lab, F-31062 Toulouse, France

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 18期

关键词：

EXCITATIONS; ORDER;

D O I：

10.1103/PhysRevB.81.180402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The low-energy singlet dynamics of the quantum Heisenberg antiferromagnet on the kagome lattice is described by a quantitative quantum dimer model. Using advanced numerical tools, the latter is shown to exhibit valence-bond crystal (VBC) order with a large 36-site unit cell and hidden degeneracy between even odd parities. Evidences are given that this ground state lies in the vicinity of a Z(2) dimer-liquid region separated by a quantum critical point (QCP). Implications regarding numerical analysis and experiments are discussed.

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页数：4

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