Quantum spin liquid near Mott transition with fermionized π-vortices

被引：3
|
作者：
Kou, S. -P. [1 ]
Liu, L. -F. [1 ]
He, J. [1 ]
Wu, Y. -J. [1 ]
机构：
[1] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL B | 2011年 / 81卷 / 02期
关键词：
MEAN-FIELD THEORY; LARGE-N LIMIT; HEISENBERG ANTIFERROMAGNETS; HUBBARD-MODEL; GROUND-STATES; INSULATOR; TOPOLOGY; SYSTEMS; ENERGY; KAGOME;
D O I：
10.1140/epjb/e2011-10992-5
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
In this paper, we study the non-magnetic insulator state near Mott transition of 2D pi-flux Hubbard model on square lattice and find that such non-magnetic insulator state is quantum spin liquid state with nodal fermionic excitations - nodal spin liquid (NSL). When there exists small easy-plane anisotropic energy, the ground state becomes Z (2) topological spin liquid (TSL) with full gapped excitations. The U(1) x U(1) mutual-Chern-Simons (MCS) theory is obtained to describe the low energy physics of NSL and TSL.
引用
收藏
页码：165 / 177
页数：13
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