We present a review of the developments leading to our present understanding of the excitation spectrum of planar and uniaxial Heisenberg chains (xxz) as probed by dynamic form factors. Exact zero‐temperature results, finite‐chain calculations for s = 1/2, and molecular‐dynamics results, realistic for s≫1 and T≳0, are discussed, and the role of envelope solitons clarified.
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© 1982 American Institute of Physics.
1982
American Institute of Physics
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