Rybkin, A. G.; Tarasov, A. V.; Rybkina, A. A.; Voroshnin, V. Yu.; Estyunin, D. A.; Usachov, D. Yu.; Petukhov, A. E.; Pudikov, D. A.; Eryzhenkov, A. V.; Klimovskikh, I. I.; Sánchez-Barriga, J.; Varykhalov, A.; Kumar, Y.; Kumar, S.; Iwata, T.; Kuroda, K.; Miyamoto, K.; Okuda, T.; Shimada, K.; Frolov, A. S.; Stolyarov, V. S.; Shikin, A. M.: Emergent Dirac fermions in graphene and underlying Au monolayer with two-dimensional ferrimagnetism. Nanoscale 17 (2025), p. 21706-21716
10.1039/d5nr01969a
Abstract:
Using angle-resolved photoemission spectroscopy (ARPES) with spin resolution, scanning tunneling microscopy/spectroscopy (STM/STS) and density functional theory (DFT) methods, we study the electronic structure of graphene-covered and bare Au/Co(0001) systems and reveal intriguing features, arising from the ferrimagnetic order in graphene and the underlying gold monolayer. In particular, a spin-polarized Dirac-cone-like state, intrinsically related to the induced magnetization of Au, was discovered at overline upperclass gamma point. We have obtained a good agreement between experiment and theory for bare and graphene-covered Au/Co(0001) and have proven that both Au ferrimagnetism and the Dirac-cone-like band are intimately linked to the triangular loop dislocations present at the Au/Co interface. STM measurements and simulation of the local density of states reveal a magnetic band gap in the electronic structure of graphene for out-of-plane magnetization. This gap is promising for achieving a quantum anomalous Hall state in graphene.