99-65 T. Michoel, A. Verbeure
Mathematical Structure of Magnons in Quantum Ferromagnets (25K, LaTeX 2e) 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 quasi-particle 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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