Quantum spin liquid with fermionized pi-vortices
Strongly Correlated Electrons
2015-03-13 v2 Superconductivity
Abstract
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 Z2 topological spin liquid (TSL) with full gapped excitations. The U(1)times U(1) mutual--Chern-Simons (MCS) theory is obtained to describe the low energy physics of NSL and TSL.
Cite
@article{arxiv.0910.2070,
title = {Quantum spin liquid with fermionized pi-vortices},
author = {Su-Peng Kou and Lan-Feng Liu and Jing He and Ya-Jie Wu},
journal= {arXiv preprint arXiv:0910.2070},
year = {2015}
}