Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 59: Spin Excitations II/ Spin Scattering
MA 59.7: Vortrag
Donnerstag, 17. März 2011, 18:45–19:00, HSZ 04
Confinement of kinks in a quantum one-dimensional Ising ferromagnet — •Sergei B. Rutkevich — Universität Duisburg-Essen, Duisburg, Deutchland
Confinement of topological excitations (the kinks) typically takes place in one-dimensional quantum systems having a discrete vacuum degeneracy, if the latter is explicitly broken by an external field. This phenomenon has been recently observed by Coldea et. al. (2010 Science 327 177) in the Ising spin-chain ferromagnet CoNb2O6 at low temperatures. A phenomenological model has been proposed by Coldea et. al. to interpret the observed energy spectra of the magnetic excitations - the bound states of two kinks. We solve this model exactly and give explicit formulas for the kink bound state energies and for the related neutron scattering intensities. Possible modifications of the model are discussed as well.