Magnon Decay in Noncollinear Quantum Antiferromagnets
Strongly Correlated Electrons
2007-05-23 v4
Abstract
Instability of the excitation spectrum of an ordered noncollinear Heisenberg antiferromagnet (AF) with respect to spontaneous two-magnon decays is investigated. We use a spin-1/2 AF on a triangular lattice as an example and examine the characteristic long- and short wave-length features of its zero-temperature spectrum within the 1/S-approximation. The kinematic conditions are shown to be crucial for the existence of decays and for overall properties of the spectrum. The XXZ and the J-J' generalizations of the model, as well as the role of higher-order corrections are discussed.
Keywords
Cite
@article{arxiv.cond-mat/0608035,
title = {Magnon Decay in Noncollinear Quantum Antiferromagnets},
author = {A. L. Chernyshev and M. E. Zhitomirsky},
journal= {arXiv preprint arXiv:cond-mat/0608035},
year = {2007}
}
Comments
4.0 pages, 4 figures, published version + updated reference