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Spin and charge are two interrelated properties of electrons. However, mostof previous works on topological matter study the electronic and magnonicexcitations separately. In this paper, by combining density functional theorycalculations with the Schwinger boson method, we determine the topologicalelectronic band structures and topological magnon spectrum simultaneously inthe ferromagnetic ground state of the narrow-band-gap CoCu3(OH)6Cl2, which isan ABC stacking Kagome lattice material with fractional occupancy on Cu sites.This material provides an ideal platform to study the interplay of differenttypes of topological excitations. Our work also proposes a useful method todeal with correlated topological magnetic systems with narrow band gaps.

Concurrence of topological electrons and magnons in the Kagome ferromagnet CoCu3(OH)6Cl2