Parallel transport and layer-resolved thermodynamic measurements in twisted bilayer graphene

Abstract

We employ dual-gated 30°-twisted bilayer graphene to demonstrate simultaneous ultra-high 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.

This is the unedited authors' version of the submitted article, published in Phys. Rev. B 104, L241410 (2021), 23 pages, main text and supplementary information

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• Supersymmetry dictated topology in periodic gauge fields and realization in strained and twisted 2D materials
• Manipulating electron waves in graphene using carbon nanotube gating
• Quantum Hall Effect at 0.002T