Kagome lattice Hubbard model at half filling

被引：13

作者：

Guertler, Siegfried ^{[1
]}

机构：

[1] Tech Univ Dortmund, Lehrstuhl Theoret Phys 2, D-44221 Dortmund, Germany

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 08期

关键词：

ANTIFERROMAGNET;

D O I：

10.1103/PhysRevB.90.081105

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the kagome lattice Hubbard model at half filling using the variational Monte Carlo method by testing the U(1)-Dirac spin-liquid, uniform, and valence bond crystal states. Even for the large-U case, the U(1) Dirac state, which is the optimal state in the Heisenberg model, cannot be recovered. While the finite-U Hubbard model allows for the introduction of vacancies in a different manner compared to the t-J model, the physics appears to have many similarities. In particular, a valence bond crystal is formed in the intermediate-U regime. We observe an impact of the formation of this valence bond crystal on a possible Mott transition in this model and discuss the properties of the wave function.

引用

页数：5

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