Spin dynamics of dimerized Heisenberg chains

Details Spin dynamics of dimerized Heisenberg chains Spin dynamics of dimerized Heisenberg chains

1996-12-02

arxiv.org/abs/cond-mat/9612013v1

Europhys. Lett. Vol. 37, p189 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

submitted to EPL

Scientific paper

10.1209/epl/i1997-00102-1

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 $v_s=\pi/2 J(1-b\alpha)$ with $b\approx1.12$

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