Origin of Giant Rashba Effect in Graphene on Pt/SiC

Rybkina, A.A.; Gogina, A.A.; Tarasov, A.V.; Xin, Y.; Voroshnin, V.Y.; Pudikov, D.A.; Klimovskikh, I.I.; Petukhov, A.E.; Bokai, K.A.; Yuan, C.; Zhou, Z.; Shikin, A.M.; Rybkin, A.G. Origin of Giant Rashba Effect in Graphene on Pt/SiC. Symmetry 2023, 15, 2052. Rybkina, A.A.; Gogina, A.A.; Tarasov, A.V.; Xin, Y.; Voroshnin, V.Y.; Pudikov, D.A.; Klimovskikh, I.I.; Petukhov, A.E.; Bokai, K.A.; Yuan, C.; Zhou, Z.; Shikin, A.M.; Rybkin, A.G. Origin of Giant Rashba Effect in Graphene on Pt/SiC. Symmetry 2023, 15, 2052.

Abstract

Intercalation of noble metals can produce giant Rashba-type spin-orbit splittings in graphene. The spin-orbit splitting more than 100 meV has not yet been achieved in graphene on a metallic or a semiconductor substrate. Here, we report the p-type graphene obtained by Pt intercalation of zero-layer graphene on SiC substrate. The spin splitting of ∼200 meV was observed at a wide range of binding energies. Comparing the results of theoretical studies of different models with the experimantal ones measured by spin-ARPES, XPS and STM methods, we came to the conclusion that inducing giant spin-orbit splitting requires not only a fairly close arrangement of graphene to Pt layer, but also the presence of graphene corrugation caused by non-flat Pt layer. This makes it possible to find a compromise between strong hybridization and increased spin-orbit interaction. In our case, this is achieved by forming Pt submonolayer ordered on a nanometer scale under graphene.

Keywords

graphene; spin-ARPES; Rashba spin-orbit coupling, spin-orbit splitting; graphene on silicon carbide; intercalation

Subject

Physical Sciences, Condensed Matter Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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