Magnon Decay in Noncollinear Quantum Antiferromagnets

Details Magnon Decay in Noncollinear Quantum Antiferromagnets Magnon Decay in Noncollinear Quantum Antiferromagnets

2006-08-01

arxiv.org/abs/cond-mat/0608035v4

Phys. Rev. Lett. 97, 207202 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4.0 pages, 4 figures, published version + updated reference

Scientific paper

10.1103/PhysRevLett.97.207202

Instability of the excitation spectrum of an ordered noncollinear Heisenberg antiferromagnet (AF) with respect to spontaneous two-magnon decays is investigated. We use a spin-1/2 AF on a triangular lattice as an example and examine the characteristic long- and short wave-length features of its zero-temperature spectrum within the 1/S-approximation. The kinematic conditions are shown to be crucial for the existence of decays and for overall properties of the spectrum. The XXZ and the J-J' generalizations of the model, as well as the role of higher-order corrections are discussed.

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