Dynamical effects of phonons on soliton binding in spin-Peierls systems

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  • 4 February 1998
Abstract
The role of dynamical magneto-elastic coupling in spin-Peierls chains is investigated by various numerical techniques. We show that a Heisenberg spin chain coupled to dynamical optical phonons exhibits a transition towards a spontaneously dimerized state in a wide range of parameter space. The low energy excitations are characterized as topological solitons. No binding between solitons is observed in the isolated spin-phonon chain and the dynamical spin structure factor shows a broad magnon dispersion. However, elastic interchain coupling leads to a narrowing of the magnon resonances.

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