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Out-of-plane dielectric susceptibility of graphene in twistronic and Bernal bilayers

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Sergey Slizovskiy
  • Aitor Garcia-Ruiz
  • A. I. Berdyugin
  • X. Na
  • T. Taniguchi
  • K. Watanabe
  • Andre Geim
  • Neil Drummond
  • V. L. Fal'ko
<mark>Journal publication date</mark>11/08/2021
<mark>Journal</mark>Nano Letters
Issue number15
Number of pages6
Pages (from-to)6678-6683
Publication StatusPublished
Early online date23/07/21
<mark>Original language</mark>English


We describe how the out-of-plane dielectric polarizability of monolayer graphene influences the electrostatics of bilayer graphene - both Bernal (BLG) and twisted (tBLG). We compare the polarizability value computed using density functional
theory with the output from previously published experimental data on the electrostatically controlled interlayer asymmetry potential in BLG and data on the on-layer density distribution in tBLG. We show that monolayers in tBLG are described well by polarizability αexp = 10.8 Å3 and effective out-of-plane dielectric susceptibility ϵz = 2.5, including their on-layer electron density distribution at zero magnetic field and the interlayer Landau level pinning at quantizing magnetic fields.