Journal Article

FZJ-2024-04611

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spin-Dependent π π * Gap in Graphene on a Magnetic Substrate

Sheverdyaeva, P. M. (Corresponding author) ; Bihlmayer, G.FZJ* ; Cappelluti, E. ; Pacilé, D. ; Mazzola, F. ; Atodiresei, N.FZJ* ; Jugovac, M. ; Grimaldi, I. ; Contini, G. ; Kundu, A. K. ; Vobornik, I. ; Fujii, J. ; Moras, P. ; Carbone, C. ; Ferrari, L.

2024
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.132.266401  doi:10.34734/FZJ-2024-04611

Abstract: 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 Eu-intercalation of graphene/Ni(111) restores the nearly freestanding dispersion of the ππ∗ 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.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (PGI-1)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)
2. SFB 1238 C01 - Strukturinversionsasymmetrische Materie und Spin-Orbit-Phänomene mittels ab initio (C01) (319898210) (319898210)

Appears in the scientific report 2024

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