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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Massive Dirac fermions in single-layer graphene.

D V Khveshchenko¹

¹Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|August 6, 2011

Summary

This study explores many-body interactions that create a gap in graphene

Area of Science:

Condensed Matter Physics
Materials Science

Background:

Graphene exhibits a Dirac fermion spectrum, typically without a band gap.
Recent photoemission and tunneling studies suggest the presence of a gap.
Understanding the origin of this gap is crucial for graphene's electronic applications.

Purpose of the Study:

Investigate potential many-body mechanisms responsible for a finite gap in graphene's Dirac fermion spectrum.
Examine the role of Coulomb and electron-phonon interactions in driving pairing instabilities.

Main Methods:

Theoretical analysis of many-body interactions in graphene.
Focus on Peierls and Cooper-like pairing instabilities.
Comparison with experimental and Monte Carlo simulation data.

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Main Results:

Identified Coulomb interactions as a potential driver for Peierls-like instabilities.
Identified electron-phonon interactions as a potential driver for Cooper-like instabilities.
Theoretical findings align well with existing experimental and simulation results.

Conclusions:

Many-body effects, specifically Peierls and Cooper-like instabilities, can explain the observed finite gap in graphene.
The findings provide a theoretical framework consistent with experimental observations.
Further research can explore the precise conditions favoring these instabilities in graphene.