Eur. Phys. J. B 5, 487-494 (1998)
https://doi.org/10.1007/s100510050470

The 1D spin-1/2 AF-Heisenberg model in a staggered field^*

Physics Department, University of Wuppertal, 42097 Wuppertal, Germany

Corresponding author: ^a karbach@wptsb.uni-wuppertal.de

Received: 27 February 1998
Accepted: 17 April 1998
Published online: 15 October 1998

Abstract

We investigate the scaling properties of the excitation energies and transition amplitudes of the one-dimensional spin-1/2 antiferromagnetic Heisenberg model exposed to an external perturbation. Two types of perturbations are discussed in detail: a staggered field and a dimerized field.