Doping Graphene with Substitutional Mn

Area of Science:

• Materials Science
• Condensed Matter Physics
• Surface Science

Background:

• Epitaxial graphene on Cu(111) exhibits unique electronic properties, including a Dirac-like band structure.
• Introducing magnetic dopants into graphene is crucial for spintronic applications.
• Controlling the precise atomic location and concentration of dopants is essential for understanding their effects.

Purpose of the Study:

• To incorporate substitutional manganese (Mn) atoms into epitaxial graphene on Cu(111) using ultralow-energy ion implantation.
• To characterize the atomic structure and concentration of substitutional Mn.
• To investigate the electronic properties of Mn-doped graphene and its potential for studying magnetic phenomena.

Main Methods:

• Ultralow-energy ion implantation of Mn atoms into graphene on Cu(111).
• Detailed atomic structure characterization, including Mn position relative to the Moiré superstructure and carbon sublattice.
• Quantification of Mn concentration and assessment of structural disorder.
• Measurement of electronic properties to determine the effect of Mn doping on the Dirac band structure.

Main Results:

• Substitutional Mn atoms were successfully incorporated into graphene, primarily located slightly below the graphene layer (towards the Cu surface).
• The concentration of substitutional Mn was quantified to be around 0.04% with minimal additional structural disorder.
• Graphene doped with Mn retained its Dirac-like band structure, indicating preservation of key electronic properties.
• Ultralow-energy ion implantation was confirmed as a suitable technique for substitutional magnetic doping of graphene.

Conclusions:

• Ultralow-energy ion implantation enables precise substitutional magnetic doping of graphene.
• Mn-doped graphene on Cu(111) retains its Dirac band structure, offering a platform for exploring magnetic interactions with Dirac electrons.
• This method provides a flexible, reproducible, and scalable approach for magnetic functionalization of graphene and other 2D materials.