We demonstrate that point-like defects in non-collinear magnets give rise to a highly dispersive structure in the magnon scattering, violating a standard paradigm of its momentum independence. For a single impurity spin coupled to a prototypical non-collinear antiferromagnet we find that the resolvent is dominated by a distinct dispersive structure with its momentum-dependence set by the magnon dispersion and shifted by the ordering vector. This feature is a consequence of umklapp scattering off the impurity-induced spin texture, which arises due to the non-collinear ground state of the host system. Detailed results for the staggered and uniform magnetization of this texture as well as the T-matrix from numerical linear spin-wave theory are presented.
@article{arxiv.1212.2972,
title = {Highly Dispersive Scattering From Defects In Non-Collinear Magnets},
author = {Wolfram Brenig and A. L. Chernyshev},
journal= {arXiv preprint arXiv:1212.2972},
year = {2013}
}