Quantum Non-Magnetic state near Metal-Insulator Transition - a Possible Candidate of Spin Liquid State
Strongly Correlated Electrons
2015-04-28 v2
Abstract
In this paper, based on the formulation of an O(3) non-linear sigma model, we study the two-dimensional Pi-flux Hubbard model at half-filling. A quantum non-magnetic insulator is explored near the metal-insulator transition that may be a possible candidate of the spin liquid state. Such quantum non-magnetic insulator on square lattice is not induced by frustrations. Instead, it originates from quantum spin fluctuations with relatively small effective spin moments. In the strong-coupling limit, our results of the spin velocity and spin order parameter agree with results obtained from earlier calculations.
Keywords
Cite
@article{arxiv.0812.2524,
title = {Quantum Non-Magnetic state near Metal-Insulator Transition - a Possible Candidate of Spin Liquid State},
author = {Gao-Yong Sun and Su-Peng Kou},
journal= {arXiv preprint arXiv:0812.2524},
year = {2015}
}
Comments
6 pages, 6 figures, Version of publication in EPL, removing the contents of honeycomb lattice and adding some contents of square lattice