Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1996-12-04
Nonlinearity 11 (1998) 265
Physics
Condensed Matter
Strongly Correlated Electrons
33 pages, TeX, 14 postscript figures included
Scientific paper
10.1088/0951-7715/11/2/005
The dynamics of vortices in a 2D Heisenberg antiferromagnet with an easy-plane anisotropy is studied numerically within the discrete spin model as well as analytically within a continuum approximation based on a suitable extension of the relativistic nonlinear sigma model. We find that two like vortices scatter at 90 degrees during a head-on collision, whereas a vortex-antivortex pair is annihilated into spinwave radiation emitted mainly at 90 degrees. When a uniform bias field is applied, vortex dynamics is affected rather profoundly and acquires the characteristic features of the Hall effect of electrodynamics or the Magnus effect of fluid dynamics. In particular, a single vortex is always spontaneously pinned, two like vortices form a rotating bound state, and a vortex-antivortex pair undergoes Kelvin motion. Finally, in the presence of a bias field, vortices are shown to be the prominent topological excitations even for an isotropic antiferromagnet.
Komineas Stavros
Papanicolaou Nikos
No associations
LandOfFree
Vortex dynamics in 2D antiferromagnets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Vortex dynamics in 2D antiferromagnets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vortex dynamics in 2D antiferromagnets will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-469381