We study numerically the dimerized Heisenberg model with frustration appropriate for the quasi-1D spin-Peierls compound CuGeO3. We present evidence for a bound state in the dynamical structure factor for any finite dimerization δ and estimate the respective spectral weight. For the homogeneous case (δ=0) we show that the spin-wave velocity vs is renormalized by the n.n.n. frustration term α as vs=π/2J(1−bα) with b≈1.12
@article{arxiv.cond-mat/9612013,
title = {Spin dynamics of dimerized Heisenberg chains},
author = {Andreas Fledderjohann and Claudius Gros},
journal= {arXiv preprint arXiv:cond-mat/9612013},
year = {2016}
}