ABSTRACT Unveiling and manipulating topologically non‐trivial electronic states represents a key task in designing and realizing topological quantum materials that exhibit strong Berry curvature and large transverse transport effects. Beyond achieving topological band inversion via heavy‐element substitution in semiconductors, the intrinsic nature of linear band‐crossing and the diversity of topological states have drawn significant attention. In this study, using symmetry breaking induced by space group transformation in a ferromagnetic Heusler platform, we reveal a topologically non‐trivial electronic band structure, termed as the topological umbrella that comprises twofold degenerate spin‐up bands and threefold degenerate spin‐down bands, originating from the interplay of crystal field splitting, spin splitting, and spin–orbit coupling. Leveraging its relatively flat band dispersion and linear band crossing, the umbrella structure can be exploited to effectively modulate the topological properties, thereby enabling the anomalous Hall conductivity to be tuned from 98 Ω − 1 cm − 1 to an exceptionally high value of 3032 Ω − 1 cm − 1 . Our study not only demonstrates a non‐trivial topological umbrella electronic state, but also proposes a material design scheme for manipulating the topological electronic states and transport physics, paving the way for the emerging topological spintronics that advances the future quantum devices and applications.
Liu et al. (Fri,) studied this question.