Spin waves, vortices, and the structure of equilibrium states in the classical $XY$ model

Fröhlich, JürgPfister, Charles-Edouard2008-11-272008-11-272008-11-27198310.1007/BF01214657https://infoscience.epfl.ch/handle/20.500.14299/31861WOS:A1983QX16300001Spin waves, vortices, and the structure of equilibrium states in the classical $XY$ modeltext::journal::journal article::research article