P.M. Sheverdyaeva1, G. Bihlmayer2, E. Cappelluti1, D. Pacilé3, F. Mazzola4,5, N. Atodiresei2, M. Jugovac6, I. Grimaldi3, G. Contini7, A.K. Kundu1,8,9, I Vobornik5, J. Fujii5, P. Moras1, C. Carbone1, L. Ferrari7 1 CNR-ISM, Trieste, Italy 2 Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich, Germany 3 Physics Department, University of Calabria, Rende, Italy 4 Department of Molecular Sciences and Nanosystems, Ca’ Foscari University, Venice, Italy 5 CNR-IOM, Trieste, Italy 6 Elettra - Sincrotrone Trieste S.C.p.A., Trieste, Italy 7 CNR-ISM, Rome, Italy 8 ICTP, Trieste. Italy 9 NSLS II, Upton, New York, USA e-mail: polina.sheverdyaeva@ism.cnr.it; luisa.ferrari@ism.cnr.it Acknowledgments We acknowledge Elettra Sincrotrone Trieste for providing access to its synchrotron radiation facilities and for financial support. This work has been supported by PNRR MUR Project No. PE0000023-NQSTI and the project EUROFEL ROADMAP ESFRI. Original paper P.M. Sheverdyaeva et al., Rev. Phys. Lett. 132, 266401 (2024); DOI: 10.1103/ PhysRevLett.132.266401. Fig. 1 Figure 1. (a) The schematics of graphene/Eu/Ni(111) interface; (b) first-principles calculations of the electronic band structure of the system with a focus on the Dirac cone. Red and blue colors highlight the two opposite spin directions of graphene, green color marks Eu states; (c) corresponding experimental ARPES data, colored arrows indicate the corresponding spin; (d) experimental spin polarization taken along the dashed line of panel (c), the opposite spin polarizations are indicated by red and blue arrows; (e) spin-resolved photoemission intensity. Different Dirac cone gaps are indicated by red and blue arrows; (f) wave-vector resolved Berry curvature in the proximity of the Dirac cone. The energy scale is referred to the Dirac point; (g) corresponding quantum anomalous Hall conductivity. Red arrows mark the majority gap; (h) experimental Fermi surface of the heterostructure; (i) ARPES intensity taken along black dashed line in panel (h); (i) corresponding many-body simulations. Adapted from P. M. Sheverdyaeva et al., Phys. Rev. Lett. 132, 266401 (2024), with permission from Physical Review Letters. Surfaces and Interfaces Elettra Highlights 2024–2025 133
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