Suzy Zhang
Topological magnons, as a promising candidate for efficient and stable transport channel, have been studied in various magnetic materials. Their topological structure can be even richer when taking into consideration other dynamic degrees of freedom in the system. We show that nontrivial topology can emerge in the hybridized excitations of magnons and phonons in a collinear antiferromagnet due to magnetoelastic coupling. Our theory has a general applicability to two-dimensional magnets, which is demonstrated by developing a continuum theory as the long-wavelength approximation to the tight-binding model. Here, the associated topological transport can be highly tunable as magnons are thermal excitations sensitive to magnetic field. In particular, the thermal Hall effect can exhibit sign switchings as we change the direction or the strength of the applied magnetic field, which may be of practical interest in spincaloritronic applications. We provide experimentally relevant predictions for the van der Waals antiferromagnet MnPS3 and the bilayer FeCl2.
Topological magnons, as a promising candidate for efficient and stable transport channel, have been studied in various magnetic materials. Their topological structure can be even richer when taking into consideration other dynamic degrees of freedom in the system. We show that nontrivial topology can emerge in the hybridized excitations of magnons and phonons in a collinear antiferromagnet due to magnetoelastic coupling. Our theory has a general applicability to two-dimensional magnets, which is demonstrated by developing a continuum theory as the long-wavelength approximation to the tight-binding model. Here, the associated topological transport can be highly tunable as magnons are thermal excitations sensitive to magnetic field. In particular, the thermal Hall effect can exhibit sign switchings as we change the direction or the strength of the applied magnetic field, which may be of practical interest in spincaloritronic applications. We provide experimentally relevant predictions for the van der Waals antiferromagnet MnPS3 and the bilayer FeCl2.