Stacking‐Engineered Magnonic Topology and Transport in Honeycomb Homobilayers

ABSTRACT Topological magnons have emerged as a promising platform for dissipationless bosonic transport. However, a straightforward and effective strategy to engineer such topological states in real materials has yet to be fully realized. Here, a general scheme for controlling magnonic topological states via stacking engineering in van der Waals magnets is presented, which explicitly yields both magnon quantum spin Hall insulator and high‐Chern‐number magnon Chern insulator phases. Notably, based on Chern number, spin Chern number, and gapless edge states analysis, is identified as a promising and experimentally feasible candidate to host the proposed stacking‐engineered magnonic topological states. Moreover, the emergence of exotic magnon thermal Hall and spin Nernst effects in the switchable magnonic topological states is uncovered, which can serve as detectable signals for further experimental probing. The proposed systematic and general approach paves the way for generating a wide variety of switchable topological magnons, promising for low‐dissipation spin and thermal transport in spintronic devices.