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This is demonstrated in cuprates, magic\u2010angle bilayer graphene, and more recently, monolayer graphene interfaced with alkali and rare earth elements. Here, the europium density at the graphene\/rhenium interface is modulated to tune the electron doping level in monolayer graphene across the VHS point, forming either a dense or diluted europium phase. The dense phase enables flat bands at the Fermi level, while graphene remains decoupled from the Re(0001) substrate in both cases. The Dirac point is shifted over 1.5\u00a0eV below the Fermi level, and europium lifts the degeneracy of the Dirac cones: one branch hybridizes with Eu 4f states, the other retains Dirac\u2010like dispersion, as corroborated by density functional theory. X\u2010ray absorption spectroscopy reveals a mixed Eu(II)\/Eu(III) valence state in the dense phase and the persistence of Eu magnetic response up to room temperature in both. The intercalated phases exhibit exceptional thermal stability, with the diluted phase stable up to 960 K. These results highlight the potential of rare\u2010earth\u2010doped graphene for engineering flat bands, tunable Dirac\u2010cone splitting, and robust interfacial magnetism.<\/jats:p>","DOI":"10.1002\/advs.202521592","type":"journal-article","created":{"date-parts":[[2025,11,21]],"date-time":"2025-11-21T10:13:26Z","timestamp":1763720006000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Persistent Magnetism and Tunable Doping of Monolayer Graphene via Europium Density Modulation"],"prefix":"10.1002","volume":"13","author":[{"given":"M.","family":"Jugovac","sequence":"first","affiliation":[{"name":"Dipartimento di Fisica Universit\u00e0 degli studi di Trieste  Via A. Valerio 2 Trieste 34127 Italy"},{"name":"Elettra Sincrotrone Trieste S.C.p.A.  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