Abstract
The XY and the anisotropic Heisenberg models are considered above the Kosterlitz-Thouless transition temperature. Under the assumption of a gas of freely moving vortices, it is shown that the dynamic structure factor exhibits a central peak for both in-plane and out-of-plane correlations, in good agreement with the results of a combined Monte Carlo–molecular dynamics simulation. These results are also consistent with recent neutron-scattering data on and (, which show qualitatively the same wave-vector and temperature dependences.
- Received 5 February 1987
DOI:https://doi.org/10.1103/PhysRevLett.59.117
©1987 American Physical Society