title: Magnon decay in noncollinear quantum antiferromagnets.
abstract: Instability of the excitation spectrum of an ordered noncollinear Heisenberg antiferromagnet with respect to spontaneous two-magnon decays is investigated. We use a spin-1/2 antiferromagnet on a triangular lattice as an example and examine the characteristic long- and short-wavelength 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.
authors.affiliation: Department of Physics, University of California, Irvine, California 92697, USA.
authors.forename: A L
authors.initials: AL
authors.lastname: Chernyshev
authors.forename: M E
authors.initials: ME
authors.lastname: Zhitomirsky