Doping on the kagome lattice: A variational Monte Carlo study of the t-J model

被引：12
|
作者：
Guertler, Siegfried [1 ]
Monien, Hartmut [1 ]
机构：
[1] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany
来源：
PHYSICAL REVIEW B | 2011年 / 84卷 / 17期
关键词：
ANTIFERROMAGNET; SYSTEMS; STATE;
D O I：
10.1103/PhysRevB.84.174409
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study doping on the kagome lattice by exploring the t-J model with variational Monte-Carlo. We use a number of Gutzwiller projected spin-liquid and valence-bond-crystal states and compare their energies at several system sizes. We find that introducing mobile holes drives the system away from the spin-liquid state proposed by Ran et al. [Y. Ran, M. Hermele, P. A. Lee, and X. G. Wen, Phys. Rev. Lett. 98, 117205 ( 2007)] for the undoped system, toward a uniform state with zero flux. On top of the uniform state a valence-bond crystal of the Hastings type is formed for low doping. The results are compared and agree well with exact diagonalization on small clusters.
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页数：4
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