Instability of antiferromagnetic magnons in strong fields
M. E. Zhitomirsky, A. L. Chernyshev
Abstract
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 Hc. 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.
Create a lesson
Related papers
Honeycomb Crystal in a Mass-Asymmetric Electron-Hole Bilayer
Shengdu Chai, Wangqian Miao, Yuqiang Li et al.
Microscopic Theory of the Acoustic Faraday Effect in Spin-Orbit Coupled Magnets
Antoine Matar, Haoting Xu, Hae-Young Kee
Emergent low-energy thermodynamics and universal B/T scaling in α-RuCl3
A. Khansili, B. J. Ramshaw, A. Bangura et al.
Mutual information across the commensurate--incommensurate crossover and near the Kosterlitz--Thouless point of the spin-12 J1--J2 Heisenberg chain
Wuttichai Pankeaw, Pruet Kalasuwan
Magnetic properties and excitation spectrum of the S = 1/2 three-legged spin ladder, LiMoOP2O7
Aly H Abdeldaim, Alexander A. Tsirlin, Jacques Ollivier et al.
Quantum Ising transition on the Cayley tree: boundary criticality, universality, and an effective Bethe line
Pietro Richelli, Natalia Chepiga