1801.00874v3.pdf (9.75 MB)
Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet β-Li2IrO3
journal contribution
posted on 2018-07-03, 10:16 authored by Samuel Ducatman, Ioannis RousochatzakisIoannis Rousochatzakis, Natalia B. Perkins© 2018 American Physical Society. We present a theoretical study of the static and dynamical properties of the three-dimensional, hyperhoneycomb Kitaev magnet β-Li2IrO3. We argue that the observed incommensurate order can be understood in terms of a long-wavelength twisting of a nearby commensurate period-3 state, with the same key qualitatively features. The period-3 state shows very different structure when either the Kitaev interaction K or the off-diagonal exchange anisotropy Γ is dominant. A comparison of the associated static spin structure factors with reported scattering experiments in zero and finite fields gives strong evidence that β-Li2IrO3 lies in the regime of dominant Kitaev coupling, and that the Heisenberg exchange J is much weaker than both K and Γ. Our predictions for the magnon excitation spectra, the dynamical spin structure factors, and their polarization dependence provide additional distinctive fingerprints that can be checked experimentally.
History
School
- Science
Department
- Physics
Published in
Physical Review BVolume
97Issue
12Citation
DUCATMAN, S., ROUSOCHATZAKIS, I. and PERKINS, N.B., 2018. Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet β-Li2IrO3. Physical Review B, 97: 125125.Publisher
© American Physical SocietyVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2018-02-21Publication date
2018-03-16Notes
This paper was accepted for publication in the journal Physical Review B and the definitive published version is available at https://doi.org/10.1103/PhysRevB.97.125125ISSN
2469-9950eISSN
2469-9969Publisher version
Language
- en