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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
Peierls-type instability and tunable band gap in functionalized graphene
D A Abanin1, A V Shytov, L S Levitov
1Department of Physics, Princeton Center for Theoretical Science, Princeton University, Princeton New Jersey 08544, USA.
Physical Review Letters
|September 28, 2010
Summary
Functionalizing graphene with adatoms creates an ordered state, opening a tunable band gap. This engineered band gap is robust against disorder, offering a new way to control graphene's electronic properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Functionalizing graphene significantly alters its electronic properties.
- Understanding adatom interactions is key to controlling graphene's behavior.
Purpose of the Study:
- Investigate the spatial ordering of adatoms on graphene.
- Explore the resulting electronic band structure modifications.
- Determine the feasibility of engineering a tunable band gap in graphene.
Main Methods:
- Studied adatom ordering driven by RKKY-type interactions.
- Analyzed the Peierls-instability-type mechanism for sublattice occupation.
- Investigated Bragg scattering of electron waves due to sublattice symmetry breaking.
Main Results:
- Adatoms preferentially occupy one graphene sublattice in an ordered state.
- Sublattice symmetry breaking opens a band gap, giving Dirac fermions mass.
- The band gap is robust against adatom positional disorder.
- The gapped state is stable across a range of electron doping levels.
Conclusions:
- Controlled adatom adsorption enables engineering of a tunable band gap in graphene.
- This method offers a route to precisely control graphene's electronic properties.
- The resulting band gap is remarkably stable and robust.
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