Reconstructed Fermi surface in graphene on Ir(111) by Gd-Ir surface alloying
- Resource Type
- Authors
- I. I. Klimovskikh; D. A. Estyunin; Alexander M. Shikin; Andrei Varykhalov; M. Krivenkov
- Source
- Carbon. 147:182-186
- Subject
- Condensed Matter::Quantum Gases
Materials science
Condensed matter physics
Graphene
Photoemission spectroscopy
Superlattice
Fermi level
Fermi surface
Angle-resolved photoemission spectroscopy
02 engineering and technology
General Chemistry
Electronic structure
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
law.invention
symbols.namesake
law
Topological insulator
symbols
General Materials Science
0210 nano-technology
- Language
- ISSN
- 0008-6223
Graphene electronics covers a number of unique effects and the most intriguing ones are based on its interaction with other materials. Contact of graphene with the lattice-mismatched substrate clones the Dirac cone and gives rise to Hofstadter spectrum, while contact with the heavy/magnetic atoms realizes topological insulator phase. Here we study the electronic structure of graphene on Ir(111) with intercalated rare-earth Gd atoms by means of Angle-Resolved Photoemission Spectroscopy (ARPES). Gd intercalation results in the formation of the Gd-Ir surface alloy with the (2 × 2) superstructure, but the moire superlattice of graphene persists. Strong charge transfer from Gd atoms leads to the shifting of the Dirac cone and its replicas towards the higher binding energies while closing the u m k l a p p band gaps. The replicated Dirac cone bands cross each other near the Fermi level, that is essential for the superlattice effects application in electronics.