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Flake electrical conductivity of few-layer graphene.
Hamze Mousavi1, Jabbar Khodadadi2
1Department of Physics, Razi University, Kermanshah, Iran ; Nanoscience and Nanotechnology Research Center, Razi University, Kermanshah, Iran.
Thescientificworldjournal
|February 20, 2014
Summary
Electrical conductivity in few-layer graphene decreases with more layers and stronger interlayer hopping. Simple bilayer graphene shows higher conductivity than Bernal stacking, especially at low temperatures.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Few-layer graphene exhibits unique electronic properties.
- Understanding electrical conductivity is crucial for graphene-based electronics.
Purpose of the Study:
- To analytically calculate electrical conductivity for few-layer graphene (up to five layers).
- To compare conductivity in simple and Bernal stacking structures.
- To investigate the impact of interlayer hopping on conductivity.
Main Methods:
- Utilized the Kubo formula for electrical conductivity calculation.
- Employed the tight-binding Hamiltonian model.
- Applied the Green's function technique.
- Compared results with single-layer graphene.
Main Results:
- Electrical conductivity decreases as the number of graphene layers increases.
- Increased interlayer hopping of pz orbitals reduces conductivity.
- Conductivity change becomes less significant beyond two layers.
- A small deviation from linear behavior is observed at low temperatures.
- Simple bilayer graphene exhibits higher conductivity than Bernal stacking.
Conclusions:
- Layer number and interlayer hopping significantly influence few-layer graphene conductivity.
- Structural arrangement (simple vs. Bernal) impacts electrical performance.
- These findings are vital for designing graphene electronic devices.
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