Magnons in a Strongly Spin-Orbital Coupled Magnet
ORAL
Abstract
We present the non-linear spin-wave theory calculations of the dynamical response of an extended Kitaev-Heisenberg model for the parameters applicable to α-RuCl3. We argue that large anisotropic terms of spin-orbit nature necessarily imply strong anharmonic coupling of magnons. Subsequently, the overlap of one- and two-magnon states must lead to broad spectral features in magnon spectrum. These are accompanied by a significant longitudinal component of the structure factor from the two-magnon states that are also broadened. We calculate magnon decay rates due to anharmonic coupling within a self-consistent approach and find our results for the dynamical structure factor to be in a good agreement with both exact diagonalization results for the same set of parameters and experiment.
*The work of Pavel Maksimov and Alexander Chernyshev was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under award no. DE-FG02-04ER46174.
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Presenters
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Pavel Maksimov
- Univ of California - Irvine