Topological magnons and domain walls in twisted bilayer MoTe2

Quantum anomalous Hall insulators are zero-field Chern insulators that spontaneously break time-reversal symmetry. Here, the authors uncover topological magnons and chiral domain wall modes in the quantum anomalous Hall phase of twisted bilayer MoTe₂. A Haldane-like magnon band structure and an effective spin model with Heisenberg and Dzyaloshinskii-Moriya interactions describe these excitations and provide an estimation of the magnetic ordering temperature, illuminating the interplay between topology and magnetism in moir\'e systems.