Novel approach to description of spin liquid phases in low-dimensional quantum antiferromagnets
Strongly Correlated Electrons
2009-10-30 v1
Abstract
We consider quantum spin systems with dimerization, which at strong coupling have singlet ground states. To account for strong correlations, the excitations are described as dilute Bose gas of degenerate triplets with infinite on-site repulsion. This approach is applied to the two-layer Heisenberg model at zero temperature with general couplings. Our analytic results for the triplet gap, the excitation spectrum and the location of the quantum critical point are in excellent agreement with numerical results, obtained by dimer series expansions.
Keywords
Cite
@article{arxiv.cond-mat/9712263,
title = {Novel approach to description of spin liquid phases in low-dimensional quantum antiferromagnets},
author = {V. N. Kotov and O. Sushkov and Zheng Weihong and J. Oitmaa},
journal= {arXiv preprint arXiv:cond-mat/9712263},
year = {2009}
}
Comments
4 pages, REVTex, 3 Postscript figures