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Band Topology and Dynamic Multiferroicity Induced from Dynamical Dzyaloshinskii-Moriya Interactions in
1The University of Hong Kong, HK Institute of Quantum Science and Technology and Department of Physics, Pokfulam Road, Hong Kong, China.
Abstract:
We develop a theory of a dynamical Dzyaloshinskii-Moriya interaction (dDMI) in centrosymmetric crystals by generally considering the vibration of both cations and anions. It gives rise to an antisymmetric spin-lattice coupling, inducing magnon-phonon hybridized topological excitations. Moreover, we find that this dDMI naturally exhibits a magnetoelectric feature, leading to the presence of dynamic multiferroicity with finite toroidal moment distribution in the momentum space. By comparing toroidal moments with band skyrmion structure, we reveal the intrinsic connection between band topology and dynamic multiferroicity through the dDMI.
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