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Dirac cones and minigaps for graphene on Ir(111).

I Pletikosić¹, M Kralj, P Pervan

¹Institut za fiziku, Bijenicka 46, 10000 Zagreb, Croatia.

Physical Review Letters

|March 5, 2009

Summary

Epitaxial graphene on iridium (Ir(111)) exhibits a Dirac cone, a key electronic feature. Moiré patterns from the graphene-Ir(111) interaction create band structure modifications, including Dirac cone replicas and minigaps.

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Area of Science:

Condensed Matter Physics
Materials Science
Surface Science

Background:

Epitaxial graphene on transition metals offers tunable electronic properties.
Understanding the influence of substrate-graphene interactions is crucial for electronic applications.
Iridium(111) is a promising substrate for high-quality graphene growth.

Purpose of the Study:

To investigate the electronic band structure of epitaxial graphene on Ir(111).
To analyze the impact of the moiré superlattice on graphene's electronic properties.
To characterize the Dirac cone and related phenomena.

Main Methods:

Angle-resolved photoelectron spectroscopy (ARPES) was employed.
High-quality epitaxial graphene on Ir(111) was prepared.

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ARPES data was analyzed to identify band structure features.

Main Results:

The study clearly observed a Dirac cone in the epitaxial graphene.
The Dirac point was found to be slightly shifted above the Fermi level.
Moiré superlattice effects led to Dirac cone replicas and minigap openings.

Conclusions:

Epitaxial graphene on Ir(111) retains its Dirac cone feature.
The moiré potential significantly modifies the electronic band structure.
These findings are important for designing graphene-based electronic devices.