Magnon decay in gapped quantum spin systems

Details Magnon decay in gapped quantum spin systems Magnon decay in gapped quantum spin systems

2005-11-14

arxiv.org/abs/cond-mat/0511353v1

Physical Review Letters 96, 087203 (2006).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.96.087203

In the O(3) sigma-model description of gapped spin systems, S=1 magnons can only decay into three lower energy magnons. We argue that the symmetry of the quantum spin Hamiltonian often allows decay into two magnons, and compute this decay rate in model systems. Two magnon decay is present in Haldane gap S=1 spin chains, even though it cannot be induced by any allowed term written in powers and gradients of the sigma-model field. We compare our results with recent measurements of Stone et al. (cond-mat/0511266) on a two-dimensional spin system.

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