Dispersion of orbital excitations in 2D quantum antiferromagnets
Strongly Correlated Electrons
2012-12-19 v1
Abstract
We map the problem of the orbital excitation (orbiton) in a 2D antiferromagnetic and ferroorbital ground state onto a problem of a hole in 2D antiferromagnet. The orbiton turns out to be coupled to magnons and can only be mobile on a strongly renormalized scale by dressing with magnetic excitations. We show that this leads to a dispersion relation reflecting the two-site unit cell of the antiferromagnetic background, in contrast to the predictions based on a mean-field approximation and linear orbital-wave theory.
Keywords
Cite
@article{arxiv.1111.5522,
title = {Dispersion of orbital excitations in 2D quantum antiferromagnets},
author = {Krzysztof Wohlfeld and Maria Daghofer and Giniyat Khaliullin and Jeroen van den Brink},
journal= {arXiv preprint arXiv:1111.5522},
year = {2012}
}
Comments
4 pages, 2 figures, submitted to SCES 2011 conference proceedings