Journal Article 2D magnets 2D electron gases 2D materials Ni-based superconductors X-ray and optical spectra X-ray magnetic circular dichroism antiferromagnetism charge density waves charge localizations density functional theory exchange bias highly interfacial electron mobility interfacial excitons kagome metals magnetic order monolayer chromium telluride monolayer vanadium diselenide nickelates orbital hybridization orbital hybridizations oxide heterostructures perpendicular magnetic anisotropy phase transitions plasmons reconstructed line defects room temperature ferromagnetism scanning probe microscopy scanning tunneling microscopy screening effect