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

Slizovskiy, Sergey and Garcia-Ruiz, Aitor and Berdyugin, A. I. and Na, X. and Taniguchi, T. and Watanabe, K. and Geim, Andre and Drummond, Neil and Fal'ko, V. L. (2021) Out-of-plane dielectric susceptibility of graphene in twistronic and Bernal bilayers. Nano Letters. ISSN 1530-6984

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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Nano Letters
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
157705
Deposited By:
Deposited On:
27 Jul 2021 11:15
Refereed?:
Yes
Published?:
Published
Last Modified:
17 Oct 2021 05:43