Journal Article magnetic topological insulators 2D materials CVD Dirac fermions Kagome‐lattice MOCVD MoS2 contact scaling current crowding current‐induced switching dual-gating electric fields hard ferromagnets intimate contacts metalorganic chemistry negative differential resistance nodal line metals on‐chip synthesis quantum anomalous Hall effect quantum criticality semimetals spin fluctuations spin‐orbit torque topological materials topological phase transitions topological surface states transfer length transition metal dichalcogenides two-dimensional field-effect transistors