Rotational stability of twisted bilayer graphene

S. Bagchi, H. T. Johnson, and H. B. Chew
Phys. Rev. B 101, 054109 – Published 25 February 2020
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Abstract

Moiré superlattices form in twisted graphene bilayers due to periodic regions of commensurability, but truncation of the moiré patterns affects the rotational stability of finite-sized sheets. Here, we report the stepwise untwisting of nanometer-sized bilayer graphene flakes at elevated temperatures, each step corresponding to a potential energy barrier formed by changes to the commensurability between the moiré superlattice and flake size with twist angle. The number of locally stable energy states and their barrier energies scale with the flake size, allowing twisted graphene flakes of several tens of nanometers to remain thermally stable even at chemical vapor deposition temperatures.

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  • Received 17 December 2019
  • Accepted 31 January 2020

DOI:https://doi.org/10.1103/PhysRevB.101.054109

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Bagchi1, H. T. Johnson2, and H. B. Chew1,*

  • 1Department of Aerospace Engineering, University of Illinois at Urbana-Champaign, Urbana Illinois 61801, USA
  • 2Department of Mechanical Science and Engineering, Department of Materials Science and Engineering, and Materials Research Lab, University of Illinois at Urbana-Champaign, Urbana Illinois 61801, USA

  • *Author to whom all correspondence should be addressed: hbchew@illinois.edu

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Issue

Vol. 101, Iss. 5 — 1 February 2020

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