Ferroelectrics Drive Topological Magnon Transitions and Valley Transport

Topological magnons offer unique opportunities for low-dissipation spin transport, but achieving nonvolatile control over their topological states remains a significant challenge. Here, using a Heisenberg-Dzyaloshinskii-Moriya model and symmetry analysis, we propose a ferroelectrically tunable magnonic platform that enables reversible switching among three distinct topological phases: a second-order topological magnon insulator, a topological magnon insulator, and a normal magnon insulator. This transition is characterized by the simultaneous emergence and reversal of spontaneous magnon valley polarization. We further identify the Ti_{3}I_{8} monolayer with a breathing kagome lattice as a promising material…

• AG
  Australian Government
• NN
  National Natural Science Foundation of China

  Award: 12174220
• NS
  Natural Science Foundation of Shandong Province

  Award: ZR2023YQ001
• TS
  Taishan Scholar Project of Shandong Province
• AR
  Australian Research Council

  Awards: DE240100627, DP260102992
• NK
  National Key Research and Development Program of China

  Award: 2025CXPT204