Dynamics of twists on antiferromagnetic spin chains: Theory
Polymers and Colloids, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK
Corresponding author: a email@example.com
Published online: 2 October 2002
The equation of motion of twists on classical antiferromagnetic Heisenberg spin chains are derived. It is shown that twists interact via position- and velocity-dependent long-range two-body forces. A quiescent regime is identified wherein the system conserves momentum. With increasing kinetic energy the system exits this regime and momentum conservation is violated due to walls annihilation. A bitwist system is shown to be integrable and its exact solution is analysed. Many-twist systems are discussed and novel periodic twist lattice solutions are found on closed chains. The stability of these solutions is discussed.
PACS: 75.60.Ch – Domain walls and domain structure / 05.45.-a – Nonlinear dynamics and nonlinear dynamical systems
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002