Tuning the transport properties of Mn3Ge through the effect of strain on its magnetism

The kagome lattice antiferromagnet ${\mathrm{Mn}}_{3}\mathrm{Ge}$ has a local hexagonal symmetry with a ${120}^{\ensuremath{\circ}}$ ordered ground state. This noncollinear ground state engenders a strong anomalous Hall response. The main goal of this work is to understand the effect of strain on this response. We derive an effective model for the Hall vector which functions as our order parameter. Using this model we show how both intraplanar and interplanar strains can be used to switch the sign of the Hall response at a constant magnetic field. Further, we also investigate the effect of this strain on the spin-wave band gaps and show that strain can be used to effectively manipulate them, which can be used to tune the magnon responses in this system.