Low-energy excitations of spin-Peierls chains with modified bond-impurities
Statistical Mechanics
2009-10-31 v2
Abstract
The introduction of modified bond-defects in spin-Peierls systems is investigated in a model of antiferromagnetic Heisenberg spin chains coupled to adiabatic phonons. Generically, new low-energy magnetic or non-magnetic excitations appear below the bulk spin gap energy. When two adjacent bonds are modified, these excitations can be interpreted in terms of boundstates of a soliton with the localized spin-1/2 located on the impurity site. It is shown that the confining potential occurs even in the case of {\it isolated} chains.
Cite
@article{arxiv.cond-mat/9908134,
title = {Low-energy excitations of spin-Peierls chains with modified bond-impurities},
author = {D. Augier and J. Riera and D. Poilblanc},
journal= {arXiv preprint arXiv:cond-mat/9908134},
year = {2009}
}
Comments
final version, to appear in Phys. Rev. B