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Quantum materials with strong transport responses to disparate physicalquantities are of great fundamental significance and may hold technologicalpotentials. The interplay between interactions and topology drive suchresponses through the effects of spontaneous symmetry breaking and theassociated domain configurations on quantum transport. Here we provide acomprehensive description of the magnetism of Mn3Ge, an antiferromagnetickagomebased semimetal with room temperature transport anomalies associated withtopologically protected Weyl nodes. Using polarized neutron diffraction, weshow the all-important magnetic structure is anti-chiral and coplanar carryingthe symmetry of a ferromagnet without appreciable magnetization. We probe andclassify the long wavelength excitations that determine its macroscopicresponses including a set of collective magneto-elastic modes. We develop aphenomenological spin Hamiltonian with exchange, Dzyaloshinskii-Moriya, andcrystal field interactions to describe its collective magnetism. The itinerantcharacter of the magnetism that drives quantum transport is apparent in spinwave damping and extended magnetic interactions. Our work provides thescientific basis for manipulation of the chiral antiferromagnetic texture ofMn3Ge to control its topological quantum transport.

Antichiral spin order its Goldstone modes and their hybridization with phonons in the topological semimetal Mn3Ge