Continuum in the spin excitation spectrum of a Haldane chain (erratum)

TL;DR

This paper corrects a minor calculation error in the previous study of the spin excitation spectrum of a Haldane chain, providing a corrected figure without altering the original conclusions.

Contribution

It offers a corrected analysis of the nonlinear sigma-model prediction for the 2-magnon scattering continuum in a Haldane chain.

Findings

Correction of the 2-magnon scattering continuum figure

Minor calculation error identified and rectified

Main conclusions of the original paper remain valid

Abstract

There was a slight error in calculating the nonlinear sigma-model prediction for the 2-magnon scattering continuum shown in Fig. 2 of cond-mat/0010049, and Phys. Rev. Lett. {\bf 87}, 017202 (2001). Present erratum explains what was incorrect, and shows a corrected version of the figure. The correction is minor and does not affect main conclusions drawn in the original paper.