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Sign Changes in Heat, Spin, and Orbital Magnon Transport Coefficients in Kitaev Ferromagnets
Mesoscale and Nanoscale Physics · Submitted 21 Feb 2025
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We show that several transport coefficients feature temperature-driven sign changes in the presence of Kitaev interaction, which are absent for DMI.
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The abstract, sentence by sentence
Both Kitaev and Dzyaloshinskii-Moriya interactions (DMI) are known to promote intrinsic contributions to the magnon Hall effects such as the thermal Hall and the spin Nernst effects in collinear magnets. Previously, it was reported that a sign change in those transversal transport coefficients only appears in the presence of Kitaev interaction, but not for DMI, which qualitatively distinguishes both kinds of spin-anisotropic interactions in ferromagnets. Herein, we systematically study how the magnon-mediated heat, spin, and orbital transport in longitudinal and transverse geometries evolves with a continuously varying Kitaev-to-DMI ratio, but a fixed magnon band structure. We show that several transport coefficients feature temperature-driven sign changes in the presence of Kitaev interaction, which are absent for DMI. In particular, we find a sign change in longitudinal orbital transport, the magnon orbital Seebeck effect, which is absent in the transverse geometry, the magnon orbital Nernst effect. This sets the orbital transport apart from the heat and spin transport, where we only find sign changes promoted by the Kitaev interaction in transverse, but not in the longitudinal geometry.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Both Kitaev and Dzyaloshinskii-Moriya interactions (DMI) are known to promote intrinsic contributions to the magnon Hall effects such as the thermal Hall and the spin Nernst effects in collinear magnets. | background 1.00 | 0.03 | 0.03 | asserted 0.99 |
| s1 | Previously, it was reported that a sign change in those transversal transport coefficients only appears in the presence of Kitaev interaction, but not for DMI, which qualitatively distinguishes both kinds of spin-anisotropic interactions in ferromagnets. | background 0.94 | 0.03 | 0.10 | asserted 1.00 |
| s2 | Herein, we systematically study how the magnon-mediated heat, spin, and orbital transport in longitudinal and transverse geometries evolves with a continuously varying Kitaev-to-DMI ratio, but a fixed magnon band structure. | contribution 0.84 | 0.88 | 0.04 | asserted 0.78 |
| s3 | We show that several transport coefficients feature temperature-driven sign changes in the presence of Kitaev interaction, which are absent for DMI. | result 1.00 | 0.94 | 0.63 | asserted 1.00 |
| s4 | In particular, we find a sign change in longitudinal orbital transport, the magnon orbital Seebeck effect, which is absent in the transverse geometry, the magnon orbital Nernst effect. | result 1.00 | 0.94 | 0.16 | asserted 1.00 |
| s5 | This sets the orbital transport apart from the heat and spin transport, where we only find sign changes promoted by the Kitaev interaction in transverse, but not in the longitudinal geometry. | result 0.69 | 0.93 | 0.30 | asserted 1.00 |
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Original abstract
Both Kitaev and Dzyaloshinskii-Moriya interactions (DMI) are known to promote intrinsic contributions to the magnon Hall effects such as the thermal Hall and the spin Nernst effects in collinear magnets. Previously, it was reported that a sign change in those transversal transport coefficients only appears in the presence of Kitaev interaction, but not for DMI, which qualitatively distinguishes both kinds of spin-anisotropic interactions in ferromagnets. Herein, we systematically study how the magnon-mediated heat, spin, and orbital transport in longitudinal and transverse geometries evolves with a continuously varying Kitaev-to-DMI ratio, but a fixed magnon band structure. We show that several transport coefficients feature temperature-driven sign changes in the presence of Kitaev interaction, which are absent for DMI. In particular, we find a sign change in longitudinal orbital transport, the magnon orbital Seebeck effect, which is absent in the transverse geometry, the magnon orbital Nernst effect. This sets the orbital transport apart from the heat and spin transport, where we only find sign changes promoted by the Kitaev interaction in transverse, but not in the longitudinal geometry.
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Contests 1 paper
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It has been suggested to employ the electric polarization or the electrical voltage due to the orbital motion of magnons as probe [ref] , however, this has the shortcoming that it relies on relativistic magnetoelectric coupling [ref] and that it also includes contributions from spin currents unrelated to the magnon orbital motion [ref] .
2407.16004 · Discussion · contest 0.73
Cites as background 2 papers
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Throughout this work, we have considered the particular band structure of CrI$_3$ as an example and have neglected $$ and $'$ interactions, which can be expected to renormalize the transport properties [ref] .
Magnons, Phonons, and Thermal Hall Effect in Candidate Kitaev Magnet $\alpha$-RuCl$_3$ · Discussion · 0.87
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Throughout this work, we have considered the particular band structure of CrI$_3$ as an example and have neglected $$ and $'$ interactions, which can be expected to renormalize the transport properties [ref] .
Unveiling Non-Kitaev Interactions and Field-Angle Dependence in Topological Magnon Transport of $\alpha$-RuCl$_3$ · Discussion · 0.87
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