SCATTERING-THEORY FOR SPIN-WAVES IN QUANTUM HALL FERROMAGNETS

We propose a one-body framework to describe the scattering of bulk spi n waves at the edge of a quantum Hall ferromagnet. Scattering processe s lead to a new collection of stationary modes that turn out to be loc alized at the edge. Comparison of these states with those obtained by numerical calculations: firmly support our scheme. At filling factor 1 , these edge textures generate the whole low-lying spectrum of spin ex citations and, for actual values of the Zeeman term, answer for edge r econstruction when the magnetic field is increased.