Spin dynamics of dimerized Heisenberg chains
Physics Department, University of Wuppertal - 42097 Wuppertal, Germany
2 Institut für Physik, Universität Dortmund - 44221 Dortmund, Germany
Accepted: 12 December 1996
We study numerically the dimerized Heisenberg model with frustration appropriate for the quasi-1D spin-Peierls compound . 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 () we show that the spin-wave velocity vs is renormalized by the n.n.n. frustration term α as with .
PACS: 42.65.-k – Nonlinear optics / 78.20.-e – Optical properties of bulk materials and thin films / 78.20.Ls – Magnetooptical effects
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