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Magnon thermal Hall effect via emergent SU(3) flux on the antiferromagnetic skyrmion lattice
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Magnon thermal Hall effect via emergent SU(3) flux on the antiferromagnetic skyrmion lattice
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Journal Article
Magnon thermal Hall effect via emergent SU(3) flux on the antiferromagnetic skyrmion lattice
2024
Overview
Complexity of quantum phases of matter is often understood theoretically by using gauge structures, as is recognized by the
Z
2
and U(1) gauge theory description of spin liquids in frustrated magnets. Anomalous Hall effect of conducting electrons can intrinsically arise from a U(1) gauge expressing the spatial modulation of ferromagnetic moments or from an SU(2) gauge representing the spin-orbit coupling effect. Similarly, in insulating ferro and antiferromagnets, the magnon contribution to anomalous transports is explained in terms of U(1) and SU(2) fluxes present in the ordered magnetic structure. Here, we report thermal Hall measurements of MnSc
2
S
4
in an applied field up to 14 T, for which we consider an emergent higher rank SU(3) flux, controlling the magnon transport. The thermal Hall coefficient takes a substantial value when the material enters a three-sublattice antiferromagnetic skyrmion phase, which is in agreement with the linear spin-wave theory. In our description, magnons are dressed with SU(3) gauge field, which is a mixture of three species of U(1) gauge fields originating from the slowly varying magnetic moments on these sublattices.
Strongly correlated and topological phases of matter can be often described using the tools of quantum field theory. Here the authors report the thermal Hall effect in the antiferromagnetic skyrmion lattice of MnSc
2
S
4
, revealing transport features that can be attributed to an emergent SU(3) gauge field.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
