Geometric fluctuations in a two-dimensional quantum antiferromagnet

被引：2

作者：

Jagannathan, Anuradha ^{[1
]}

Doucot, Benoit ^{[2
,3
]}

Szallas, Attila ^{[4
]}

Wessel, Stefan ^{[5
,6
]}

机构：

[1] Univ Paris 11, CNRS, UMR 8502, Phys Solides Lab, F-91405 Orsay, France

[2] Univ Paris 06, LPTHE, F-75252 Paris 05, France

[3] CNRS, UMR 7589, F-75252 Paris 05, France

[4] Hungarian Acad Sci, Wigner Res Ctr Phys, H-1525 Budapest, Hungary

[5] Rhein Westfal TH Aachen, JARA HPC, D-52056 Aachen, Germany

[6] Rhein Westfal TH Aachen, JARA FIT, Inst Theoret Solid State Phys, D-52056 Aachen, Germany

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 09期

关键词：

HEISENBERG-ANTIFERROMAGNET; SQUARE LATTICE; ORDER; DISORDER;

D O I：

10.1103/PhysRevB.85.094434

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We consider the effects of random fluctuations in the local geometry on the ground-state properties of a two-dimensional quantum antiferromagnet. We analyze the behavior of spins described by the Heisenberg model as a function of what we call phason disorder, following a terminology used for aperiodic systems. The calculations were carried out both within linear spin-wave theory and using quantum Monte Carlo simulations. An "order by disorder" phenomenon is observed in this model, wherein antiferromagnetism is found to be enhanced by phason disorder. The value of the staggered order parameter increases with the number of defects, accompanied by an increase in the ground-state energy of the system.

引用

页数：4

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