Journal
PHYSICAL REVIEW B
Volume 104, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L241410
Keywords
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Funding
- Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP20H00354]
- CREST, JST [JPMJCR15F3]
- European Union's Horizon 2020 research and innovation program [785219, 881603]
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This study demonstrates the use of dual-gated 30 degrees-twisted bilayer graphene to achieve high mobility and conductivity. The research proposes a simplified method for measuring thermodynamic quantities in graphene-based systems.
We employ dual-gated 30 degrees-twisted bilayer graphene to demonstrate simultaneous ultrahigh mobility and conductivity (up to 40 mS at room temperature), unattainable in a single layer of graphene. We find quantitative agreement with a simple phenomenology of parallel conduction between two pristine graphene sheets, with a gate-controlled carrier distribution. Based on the parallel transport mechanism, we then introduce a method for in situ measurements of the chemical potential of the two layers. This twist-enabled approach, neither requiring a dielectric spacer, nor separate contacting, has the potential to greatly simplify the measurement of thermodynamic quantities in graphene-based systems of high current interest.
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