Eur. Phys. J. B 83, 191-195 (2011)
https://doi.org/10.1140/epjb/e2011-20340-6

Dynamics of the two-dimensional Heisenberg antiferromagnet in an external magnetic field

¹ Centro Brasileiro de Pesquisas Físicas, CEP:22290-180, Rio de Janeiro, RJ, Brazil
² Departamento de Física, ICEx, Universidade Federal de Minas Gerais, CEP:31270-901, Belo Horizonte, MG, Brazil

Corresponding author: ^a lslima@fisica.ufmg.br

Received: 3 May 2011
Revised: 4 June 2011
Published online: 28 September 2011

Abstract

In this paper we study the dynamics of the two-dimensional Heisenberg antiferromagnet in an external magnetic field at zero temperature, using the memory function formalism. The imaginary part of the memory function, which is related to the damping, shows a one peak structure. The dynamical structure factor shows a smooth peak well defined separated from another very small peak.