Quantum Nonlinear Sigma Model for Arbitrary Spin Heisenberg Antiferromagnets
Strongly Correlated Electrons
2009-11-11 v2 Other Condensed Matter
High Energy Physics - Theory
Abstract
In this Letter, we derive a quantum nonlinear sigma model (QNLSM) for quantum Heisenberg antiferromagnets (QHA) with arbitrary S (spin) values. A upper limit of the low temperature is naturally carried out for the reliability of the QNLSM. The S dependence of the effective coupling constant and the spin wave velocity in the QNLSM are also obtained explicitly. The resulting spin wave velocity for 2-dim spin-1/2 QHA highly concurs with the experimental data of high compound La2CuO4. The predicted correlation lengths for 2d QHA and spin-gap magnitudes for 1d QHA also agrees with the accurate numerical results.
Cite
@article{arxiv.cond-mat/0509628,
title = {Quantum Nonlinear Sigma Model for Arbitrary Spin Heisenberg Antiferromagnets},
author = {Jianhui Dai and Wei-Min Zhang},
journal= {arXiv preprint arXiv:cond-mat/0509628},
year = {2009}
}
Comments
4 pages, 1 figure, minor revision of the text