Quantum capacitive coupling between large-angle twisted graphene layers

Alina Mreńca-Kolasińska, Peter Rickhaus, Giulia Zheng, Klaus Richter, Thomas Ihn, Klaus Ensslin, Ming Hao Liu

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

Large-angle twisted bilayer graphene (tBLG) is known to be electronically decoupled due to the spatial separation of the Dirac cones corresponding to individual graphene layers in the reciprocal space. The close spacing between the layers causes strong capacitive coupling, opening possibilities for applications in atomically thin devices. Here, we present a self-consistent quantum capacitance model for the electrostatics of decoupled graphene layers, and further generalize it to deal with decoupled tBLG at finite magnetic field and large-angle twisted double bilayer graphene at zero magnetic field. We probe the capacitive coupling through the conductance, showing good agreement between simulations and experiments for all the systems considered. We also propose a new experiment utilizing the decoupling effect to induce a huge and tunable bandgap in bilayer graphene by applying a moderately low bias. Our model can be extended to systems composed of decoupled graphene multilayers as well as non-graphene systems, opening a new realm of quantum-capacitively coupled materials.

原文English
文章編號025013
期刊2D Materials
9
發行號2
DOIs
出版狀態Published - 2022 4月

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 材料科學(全部)
  • 凝聚態物理學
  • 材料力學
  • 機械工業

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