The rich order parameter of Spin Density Waves allows for an unusual object of a complex topological nature: a half-integer dislocation combined with a semi-vortex of the staggered magnetization. It becomes energetically preferable to ordinary dislocation due to enhanced Coulomb interactions in the semiconducting regime. Generation of these objects changes the narrow band noise frequency.
@article{arxiv.cond-mat/9911143,
title = {Topological coupling of dislocations and magnetization vorticity in Spin Density Waves},
author = {S. Brazovski and N. Kirova},
journal= {arXiv preprint arXiv:cond-mat/9911143},
year = {2007}
}
Comments
To be published in Proceedings of ECRYS-99, J. de Physique, Coll., December 1999. http://ipnweb.in2p3.fr/~lptms/membres/brazov/