Tailoring magnetism in silicon-doped zigzag graphene edges

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Single-layer graphene edges are susceptible to functionalization.
• Scanning transmission electron microscopy enables atomic-level manipulation.
• Graphene's electronic and magnetic properties are of significant research interest.

Purpose of the Study:

• To model and characterize silicon-doped zigzag graphene edges.
• To investigate the thermodynamic stability of these doped structures.
• To unveil the electronic and magnetic properties influenced by silicon doping.

Main Methods:

• Density functional theory (DFT) calculations were employed.
• A range of experimentally inspired silicon-doped zigzag graphene edge configurations were modeled.
• Thermodynamic stability, electronic, and magnetic properties were assessed.

Main Results:

• Various silicon-doped zigzag graphene edge configurations were successfully modeled.
• The thermodynamic stability of relevant configurations was determined.
• Silicon doping was shown to induce a reversion of spin orientation in adjacent carbon atoms, leading to novel magnetic properties.

Conclusions:

• Silicon doping offers a viable route to engineer the magnetic properties of graphene edges.
• The observed spin reorientation has significant implications for spintronics applications.
• This study provides a theoretical foundation for experimental efforts in silicon-doped graphene.