We investigate a new mechanism for phase transitions between topological magnon phases on the breathing kagome lattice ferromagnets with Dzyaloshinskii-Moriya interaction, which is induced by the lattice deformation. With the linear spin-wave theory, we calculate the magnonic Chern number, topological phase diagram and magnon thermal Hall conductivity at low temperature with tunable modulated exchange interactions due to the lattice deformation. We show that the modulated exchange interactions and Dzyaloshinskii-Moriya interaction strength determine the band topology of magnons. We find a sign reversal of the thermal Hall conductivity during topological phase transitions explained in terms of topological edge modes and their propagation directions. We also discuss candidate materials to realize our ideas.
|Original language||English (US)|
|Journal||Physical Review B|
|State||Published - 2021|
Bibliographical noteKAUST Repository Item: Exported on 2021-10-14
Acknowledgements: We would like to acknowledge useful discussions with Xiukun Hua, Jihuan Guan and S. Ghosh. F.Z. was supported by King Abdullah University of Science and Technology (KAUST). A.M. acknowledges support from the Excellence Initiative of Aix-Marseille Université—A*Midex, a French "Investissements d’Avenir" program. H.L. acknowledge the support from Henan University (No. CJ3050A0240050)
and National Natural Science Foundation of China (No. 11804078).