Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-08-01
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.
Chernyshev Alexander L.
Zhitomirsky Michael E.
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