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  • Letter
  • Open Access

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

G. Piccinini1,2, V. Mišeikis2,3, K. Watanabe4, T. Taniguchi5, C. Coletti2,3,*, and S. Pezzini6,†

  • 1NEST, Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
  • 2Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia, Piazza San Silvestro 12, 56127 Pisa, Italy
  • 3Graphene Labs, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
  • 4Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • 5International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • 6NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa 56127, Italy

  • *Corresponding author: camilla.coletti@iit.it
  • †Corresponding author: sergio.pezzini@nano.cnr.it
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Phys. Rev. B 104, L241410 – Published 27 December, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L241410

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.

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Outline

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Phys. Rev. B 104, L241410– Published 27 December, 2021
  • Received 11 June 2021
  • Revised 13 September 2021
  • Accepted 9 November 2021
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