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Single-Layer Behavior and Its Breakdown in Twisted Graphene Layers

A. Luican, Guohong Li, A. Reina, J. Kong, R. R. Nair, K. S. Novoselov, A. K. Geim, and E. Y. Andrei
Phys. Rev. Lett. 106, 126802 – Published 21 March 2011
Physics logo See Synopsis: Graphene with a twist

Abstract

We report high magnetic field scanning tunneling microscopy and Landau level spectroscopy of twisted graphene layers grown by chemical vapor deposition. For twist angles exceeding 3° the low energy carriers exhibit Landau level spectra characteristic of massless Dirac fermions. Above 20° the layers effectively decouple and the electronic properties are indistinguishable from those in single-layer graphene, while for smaller angles we observe a slowdown of the carrier velocity which is strongly angle dependent. At the smallest angles the spectra are dominated by twist-induced van Hove singularities and the Dirac fermions eventually become localized. An unexpected electron-hole asymmetry is observed which is substantially larger than the asymmetry in either single or untwisted bilayer graphene.

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  • Received 4 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.126802

© 2011 American Physical Society

Synopsis

Key Image

Graphene with a twist

Published 21 March 2011

A small rotation between layers in multilayer graphene radically alters its electronic properties.

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Authors & Affiliations

A. Luican1, Guohong Li1, A. Reina2, J. Kong3, R. R. Nair4, K. S. Novoselov4, A. K. Geim4,5, and E. Y. Andrei1

  • 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855,USA
  • 2Department of Materials Science and Engineering, MIT, Cambridge, Massachusetts 02139, USA
  • 3Department of Electrical Engineering and Computer Science, MIT, Cambridge, Massachusetts 02139, USA
  • 4School of Physics and Astronomy, University of Manchester, M13 9PL, Manchester, United Kingdom
  • 5Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, M13 9PL, Manchester, United Kingdom

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Issue

Vol. 106, Iss. 12 — 25 March 2011

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