Spin dynamics of dimerized Heisenberg chains

Abstract

We study numerically the dimerized Heisenberg model with frustration appropriate for the quasi-1D spin-Peierls compound CuGeO${}_3$. We present evidence for a bound state in the dynamical structure factor for any finite dimerization $\delta$ and estimate the respective spectral weight. For the homogeneous case ($\delta =0$) we show that the spin-wave velocity $v_s$ is renormalized by the n.n.n. frustration term $\alpha$ as $v_s=\pi /2J(1-b\alpha )$ with $b\approx 1.12$

submitted to EPL

References in corpus (6)

• DMRG Studies of the Spin-Half Heisenberg System with Dimerization and Frustration
• Study of the magnetic susceptibility in the spin-Peierls system CuGeO${}_3$
• Magnetic excitation spectrum of dimerized antiferromagnetic chains
• Frustration induced Raman scattering in CuGeO_3
• Temperature Dependence of the Spin-Peierls Energy Gap and Anomalous Line Shapes in CuGeO${}_3$
• Computation of Dynamical Structure Factors with the Recursion Method

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