Continuum dynamics of the 1-D Heisenberg
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F.D.M. Haldane
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Article
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1983
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Elsevier Science
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English
โ 402 KB
An action-angle representation of spin variables is used to relate the large-S Heisenberg antiferromagnet to the O(3) nonlinear sigma model quantum field theory, with precise equivalence for integral S. A variant theory is found for half-integral S. Dynamic mass generation by the Nรฉel magnon is pred