Journal Article 2D topological ferromagnetic metal Fe3GeTe2 Review Zhang-Rice singlet states Zhang-Rice triplet states charge density waves current-tunable coercive field electron-electron correlation intrinsic spin‐orbit torque and spintronics inversion symmetry breaking iron germanium telluride magnetic van der Waals materials metal-insulator transition multiferroic van der Waals NiI2 optical absorption polymorphism possible van der Waals polar metals quantum entanglement second harmonic generation second-harmonic generation spectroscopy spintronic and magnetic memory topological bands transition metal dichalcogenides transition-metal oxides unusually large spin-orbit torque vanadium ditelluride