 9965 T. Michoel, A. Verbeure
 Mathematical Structure of Magnons in Quantum Ferromagnets
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Mar 1, 99

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Abstract. We provide the mathematical structure and a simple, transparent and
rigorous derivation of the magnons as elementary quasiparticle
excitations at low temperatures and in the infinite spin limit for a
large class of Heisenberg ferromagnets. The magnon canonical variables
are obtained as fluctuation operators in the infinite spin limit. Their
quantum character is governed by the size of the magnetization.
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