Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 13, Pages 2813-2816Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.2813
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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.
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