Theory of phonon-assisted "forbidden" optical transitions in spin-gapped systems
Strongly Correlated Electrons
2009-11-10 v1
Abstract
We consider the absorption of light with emission of one S(tot)=1 magnetic excitation in systems with a spin gap induced by quantum fluctuations. We argue that an electric dipole transition is allowed on the condition that a virtual phonon instantaneously breaks the inversion symmetry. We derive an effective operator for the transition and argue that the proposed theory explains the polarized experiments in CuGeO(3) and SrCu(2)[BO(3)](2).
Cite
@article{arxiv.cond-mat/0401240,
title = {Theory of phonon-assisted "forbidden" optical transitions in spin-gapped systems},
author = {Olivier Cepas and Timothy Ziman},
journal= {arXiv preprint arXiv:cond-mat/0401240},
year = {2009}
}
Comments
9 pages, 4 figures