Bloch walls and macroscopic string states in Bethe's solution of the heisenberg ferromagnetic linear chain
We present a calculation of the lowest excited states of the Heisenberg ferromagnet in 1D for any wave vector. These turn out to be string solutions of Bethe's equations with a macroscopic number of particles in them. They are identified as generalized quantum Bloch wall states, and a simple physical picture is provided for the same.
Dhar
A
Theoretical Physics Group, Raman Research Institute, Bangalore 560080, India.
Sriram Shastry B