Nature of the Spin Liquid State of the Hubbard Model on a Honeycomb Lattice

被引：119

作者：

Clark, B. K. ^{[1
,2
]}

Abanin, D. A. ^{[1
,2
]}

Sondhi, S. L. ^{[2
]}

机构：

[1] Princeton Univ, Princeton Ctr Theoret Sci, Princeton, NJ 08544 USA

[2] Princeton Univ, Joseph Henry Labs, Dept Phys, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 08期

关键词：

HEISENBERG; SUPERCONDUCTIVITY; PHYSICS;

D O I：

10.1103/PhysRevLett.107.087204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recent numerical work [Z. Y. Meng et al., Nature (London) 464, 847 (2010)] indicates the existence of a spin liquid (SL) phase that intervenes between the antiferromagnetic and semimetallic phases of the half filled Hubbard model on a honeycomb lattice. To better understand the nature of this exotic phase, we study the quantum J(1) - J(2) spin model on the honeycomb lattice, which provides an effective description of the Mott insulating region of the Hubbard model. Employing the variational Monte Carlo approach, we analyze the phase diagram of the model. We find three phases-antiferromagnetic, an unusual Z(2) SL state, and a dimerized state with spontaneously broken rotational symmetry. We identify the Z(2) SL state as the likely candidate for the SL phase of the Hubbard model.

引用

页数：4

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