Dynamics of the two-dimensional Heisenberg antiferromagnet in an external magnetic field
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 email@example.com
Revised: 4 June 2011
Published online: 28 September 2011
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.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011