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

Abstract

The role of dynamical magneto-elastic coupling in spin-Peierls chains is investigated by numerical and analytical 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 solitons. No binding between solitons occurs in the isolated spin-phonon chain and the dynamical spin structure factor shows a broad magnon dispersion. However, elastic interchain coupling can lead to the formation of bound states.

5 pages, 3 figures, revised version

References in corpus (4)

• Double gap and solitonic excitations in the spin-Peierls chain CuGeO3
• Raman, infrared and optical spectra of the spin-Peierls compound NaV_2O_5
• Symmetry and dimension of the magnon dispersion of inorganic spin-Peierls systems
• Molecular-field approach to the spin-Peierls transition in CuGeO_3

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