Spin-Dependent $\pi$$\pi$* Gap in Graphene on a Magnetic Substrate

Sheverdyaeva, P.  M.; Bihlmayer, G.; Cappelluti, E.; Pacilé, D.; Mazzola, F.; Atodiresei, N.; Jugovac, M.; Grimaldi, I.; Contini, G.; Kundu, Asish K.; Vobornik, I.; Fujii, J.; Moras, P.; Carbone, C.; Ferrari, L.

doi:10.1103/physrevlett.132.266401

Spin-Dependent $$\pi$$$$\pi$$* Gap in Graphene on a Magnetic Substrate

Journal Article · Fri Jun 28 00:00:00 EDT 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.132.266401· OSTI ID:2432551

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CNR-Istituto di Struttura della Materia (CNR-ISM), Trieste (Italy)
Forschungszentrum Juelich (Germany)
Università della Calabria (Italy)
Ca’ Foscari University of Venice (Italy); CNR-Istituto Officina dei Materiali (CNR-IOM), Trieste (Italy)
Elettra Sincrotrone Trieste (Italy)
CNR-Istituto di Struttura della Materia (CNR-ISM), Rome (Italy)
CNR-Istituto di Struttura della Materia (CNR-ISM), Trieste (Italy); International Centre for Theoretical Physics (ICTP), Trieste (Italy); Brookhaven National Laboratory (BNL), Upton, NY (United States)
CNR-Istituto Officina dei Materiali (CNR-IOM), Trieste (Italy)

Here, we present a detailed analysis of the electronic properties of graphene/Eu/Ni(111). By using angle- and spin-resolved photoemission spectroscopy and ab initio calculations, we show that the intercalation of Eu in the graphene/Ni(111) interface gives rise to a gapped freestanding dispersion of the $$\pi$$$$\pi$$* Dirac cones at the K point with an additional lifting of the spin degeneracy due to the mixing of graphene and Eu states. The interaction with the magnetic substrate results in a large spin-dependent gap in the Dirac cones with a topological nature characterized by a large Berry curvature and a spin-polarized Van Hove singularity, whose closeness to the Fermi level gives rise to a polaronic band.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 2432551

Alternate ID(s):: OSTI ID: 2474243

Report Number(s):: BNL--225927-2024-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 132; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Angle-resolved photoemission spectroscopy
Density functional theory
Electronic structure
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Many-body techniques
Spin-resolved photoemission spectroscopy

Spin-Dependent $$\pi$$$$\pi$$* Gap in Graphene on a Magnetic Substrate

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