Nonlinear Sigma model method for the J1-J2 Heisenberg model: disordered ground state with plaquette symmetry
Strongly Correlated Electrons
2007-05-23 v2 Statistical Mechanics
High Energy Physics - Theory
Abstract
A novel nonlinear sigma model method is proposed for the two-dimensional J1-J2 model, which is extended to include plaquette-type distortion. The nonlinear sigma model is properly derived without spoiling the original spin degrees of freedom. The method shows that a single disordered phase continuously extends from a frustrated uniform regime to an unfrustrated distorted regime. By the continuity and Oshikawa's commensurability condition, the disordered ground states for the uniform J1-J2 model are plaquette states with four-fold degeneracy.
Keywords
Cite
@article{arxiv.cond-mat/0306632,
title = {Nonlinear Sigma model method for the J1-J2 Heisenberg model: disordered ground state with plaquette symmetry},
author = {Ken'ichi Takano and Yoshiya Kito and Yoshiaki Ono and Kazuhiro Sano},
journal= {arXiv preprint arXiv:cond-mat/0306632},
year = {2007}
}
Comments
4 pages (including 2 figures)