Instability of antiferromagnetic magnons in strong fields

Details Instability of antiferromagnetic magnons in strong fields Instability of antiferromagnetic magnons in strong fields

1998-08-10

arxiv.org/abs/cond-mat/9808100v2

Phys. Rev. Lett. 82, 4536 (1999).

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX, 4 pages, 3 figures, accepted to PRL

Scientific paper

10.1103/PhysRevLett.82.4536

We predict that spin-waves in an ordered quantum antiferromagnet (AFM) in a strong magnetic field become unstable with respect to spontaneous two-magnon decays. At zero temperature, the instability occurs between the threshold field $H^*$ and the saturation field $H_c$. As an example, we investigate the high-field dynamics of a Heisenberg antiferromagnet on a square lattice and show that the single-magnon branch of the spectrum disappears in the most part of the Brillouin zone.

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