Tunable Fermi level and hedgehog spin texture in gapped graphene

A. Varykhalov (), J. Sánchez-Barriga, D. Marchenko, P. Hlawenka, P. S. Mandal and O. Rader
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A. Varykhalov: Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II
J. Sánchez-Barriga: Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II
D. Marchenko: Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II
P. Hlawenka: Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II
P. S. Mandal: Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II
O. Rader: Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Spin and pseudospin in graphene are known to interact under enhanced spin–orbit interaction giving rise to an in-plane Rashba spin texture. Here we show that Au-intercalated graphene on Fe(110) displays a large (∼230 meV) bandgap with out-of-plane hedgehog-type spin reorientation around the gapped Dirac point. We identify two causes responsible. First, a giant Rashba effect (∼70 meV splitting) away from the Dirac point and, second, the breaking of the six-fold graphene symmetry at the interface. This is demonstrated by a strong one-dimensional anisotropy of the graphene dispersion imposed by the two-fold-symmetric (110) substrate. Surprisingly, the graphene Fermi level is systematically tuned by the Au concentration and can be moved into the bandgap. We conclude that the out-of-plane spin texture is not only of fundamental interest but can be tuned at the Fermi level as a model for electrical gating of spin in a spintronic device.

Date: 2015
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DOI: 10.1038/ncomms8610

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