journal article·2025

Emergent Dirac fermions in graphene and underlying Au monolayer with two-dimensional ferrimagnetism

Artem G. Rybkin, Artem V. Tarasov, Anna A. Rybkina, Vladimir Yu. Voroshnin, Dmitry A. Estyunin, Dmitry Yu. Usachov, Anatoly E. Petukhov, Dmitrii A. Pudikov, Alexander V. Eryzhenkov, Ilya I. Klimovskikh, Jaime Sánchez-Barriga, Andrei Varykhalov, Yogendra Kumar, Shiv Kumar, Takuma Iwata, Kenta Kuroda, Koji Miyamoto, Taichi Okuda, Kenya Shimada, Alexander S. Frolov, Vasily S. Stolyarov, Alexander M. Shikin

Nanoscale· Volume 17· Issue 37
Publisher page

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 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.
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Research context

OpenAlex topics: Graphene research and applications · Quantum and electron transport phenomena · Surface and Thin Film Phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

St. Petersburg State University, 199034 St. Petersburg, Russia

Advanced Mesoscience and Nanotechnology Centre, Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia

Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Str. 15, D-12489 Berlin, Germany

Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Basque Country, Spain

IMDEA Nanoscience, C/Faraday 9, Campus de Cantoblanco, 28049 Madrid, Spain

Research Institute for Synchrotron Radiation Science (HiSOR), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan

Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan

International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan

Research Institute for Semiconductor Engineering, Higashi-Hiroshima, Hiroshima 739-8527, Japan

Funding

Saint-Petersburg State University · Russian Science Foundation · Japan Society for the Promotion of Science · Deutscher Akademischer Austauschdienst · Murata Science and Education Foundation · Yamada Science Foundation

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