Spin dynamics of dimerized Heisenberg chains

被引：30

作者：

Fledderjohann, A ^{[1
]}

Gros, C ^{[1
]}

机构：

[1] UNIV DORTMUND,INST PHYS,D-44221 DORTMUND,GERMANY

来源：

EUROPHYSICS LETTERS | 1997年 / 37卷 / 03期

关键词：

D O I：

10.1209/epl/i1997-00102-1

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 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 approximate to 1.12.

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页码：189 / 194

页数：6

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