Time Evolution of Spin Waves

Details Time Evolution of Spin Waves Time Evolution of Spin Waves

1999-09-10

arxiv.org/abs/cond-mat/9909146v1

Phys.Rev.Lett. 83 (1999) 3542-3545

Physics

Condensed Matter

Statistical Mechanics

4 pages, to appear in PRL

Scientific paper

10.1103/PhysRevLett.83.3542

A rigorous derivation of macroscopic spin-wave equations is demonstrated. We
introduce a macroscopic mean-field limit and derive the so-called
Landau-Lifshitz equations for spin waves. We first discuss the ferromagnetic
Heisenberg model at T=0 and finally extend our analysis to general spin
hamiltonians for the same class of ferromagnetic ground states.

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