Dispersion of orbital excitations in 2D quantum antiferromagnets

Details Dispersion of orbital excitations in 2D quantum antiferromagnets Dispersion of orbital excitations in 2D quantum antiferromagnets

2011-11-23

arxiv.org/abs/1111.5522v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures, submitted to SCES 2011 conference proceedings

Scientific paper

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.

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