Biased bilayer graphene: semiconductor with a gap tunable by the electric field effect.
← Research streamA gate bias (electric field effect) was used to externally control the electronic gap of bilayer graphene. Using magnetotransport data and a tight-binding model, the gap was extracted as a function of electronic density and could be tuned from zero to mid-inf…
Study snapshot
Abstract
We demonstrate that the electronic gap of a graphene bilayer can be controlled externally by applying a gate bias. From the magnetotransport data (Shubnikov-de Haas measurements of the cyclotron mass), and using a tight-binding model, we extract the value of the gap as a function of the electronic density. We show that the gap can be changed from zero to midinfrared energies by using fields of less, approximately < 1 V/nm, below the electric breakdown of SiO2. The opening of a gap is clearly seen in the quantum Hall regime.
AI evidence extraction
Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.
Main findings
A gate bias (electric field effect) was used to externally control the electronic gap of bilayer graphene. Using magnetotransport data and a tight-binding model, the gap was extracted as a function of electronic density and could be tuned from zero to mid-infrared energies using fields of approximately <1 V/nm.
Outcomes measured
- Electronic band gap tuning in bilayer graphene
- Magnetotransport (Shubnikov–de Haas) cyclotron mass measurements
- Quantum Hall regime evidence of gap opening
View raw extracted JSON
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"outcomes": [
"Electronic band gap tuning in bilayer graphene",
"Magnetotransport (Shubnikov–de Haas) cyclotron mass measurements",
"Quantum Hall regime evidence of gap opening"
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"main_findings": "A gate bias (electric field effect) was used to externally control the electronic gap of bilayer graphene. Using magnetotransport data and a tight-binding model, the gap was extracted as a function of electronic density and could be tuned from zero to mid-infrared energies using fields of approximately <1 V/nm.",
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"keywords": [
"bilayer graphene",
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"magnetotransport",
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}AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.
Identifiers and source
DOI: 10.1103/physrevlett.99.216802
PubMed: 18233240