Odd-parity magnon spin polarization from chiral four-spin exchange in a honeycomb antiferromagnet
Abstract
Chiral four-spin exchange generates a momentum-dependent magnon spin in a compensated honeycomb antiferromagnet at zero magnetic field. For a Néel vector tilted by an angle θ0 from the layer normal, the interaction contributes to intersublattice magnon pairing already at harmonic order, with an amplitude proportional to cosθ0sin2θ0. Biaxial anisotropy mixes the two longitudinal-spin sectors, producing nonquantized mode spins that are odd in momentum, while a sublattice-exchange relation keeps the magnon energies reciprocal. A temperature gradient then induces a spin density along the Néel axis through a redistribution of magnon occupations. Reversing the four-spin coupling reverses this spin density and the mode spins without changing the magnon energies. MnPS3 motivates the magnetic geometry; realizing the interaction requires a structural modification compatible with the symmetry assumptions of the model.
Related
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BibTeX
@misc{murzaliev2026oddparity,
title = {{Odd-parity magnon spin polarization from chiral four-spin exchange in a honeycomb antiferromagnet}},
author = {Bektur Murzaliev and Mikhail Titov},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.07291},
eprint = {2610.07291},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.07291},
}
RIS
TY - UNPB
TI - Odd-parity magnon spin polarization from chiral four-spin exchange in a honeycomb antiferromagnet
AU - Bektur Murzaliev
AU - Mikhail Titov
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2610.07291
UR - https://arxiv.org/abs/2610.07291
AB - Chiral four-spin exchange generates a momentum-dependent magnon spin in a compensated honeycomb antiferromagnet at zero magnetic field. For a Néel vector tilted by an angle θ_0 from the layer normal, the interaction contributes to intersublattice magnon pairing already at harmonic order, with an amplitude proportional to cosθ_0sin^2θ_0. Biaxial anisotropy mixes the two longitudinal-spin sectors, producing nonquantized mode spins that are odd in momentum, while a sublattice-exchange relation keeps the magnon energies reciprocal. A temperature gradient then induces a spin density along the Néel axis through a redistribution of magnon occupations. Reversing the four-spin coupling reverses this spin density and the mode spins without changing the magnon energies. MnPS_3 motivates the magnetic geometry; realizing the interaction requires a structural modification compatible with the symmetry assumptions of the model.
ER -