We employ dual-gated 30 °-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.
Parallel transport and layer-resolved thermodynamic measurements in twisted bilayer graphene
Pezzini S
2021
Abstract
We employ dual-gated 30 °-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.| File | Dimensione | Formato | |
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PhysRevB.104.L241410.pdf
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