Single Layer Behavior and Its Breakdown in Twisted Graphene Layers

Details Single Layer Behavior and Its Breakdown in Twisted Graphene Layers Single Layer Behavior and Its Breakdown in Twisted Graphene Layers

2010-10-19

arxiv.org/abs/1010.4032v1

Phys. Rev. Lett. 106, 126802 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.106.126802

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 degrees the low energy carriers exhibit Landau level spectra characteristic of massless Dirac fermions. Above 20 degrees the layers effectively decouple and the electronic properties are indistinguishable from those in single layer graphene, while for smaller angles we observe a slow-down 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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