Graphene on incommensurate substrates: Trigonal warping and emerging Dirac cone replicas with halved group velocity
- 13 August 2012
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 86 (8), 081405
- https://doi.org/10.1103/physrevb.86.081405
Abstract
The adhesion of graphene on slightly lattice-mismatched surfaces, for instance, of hexagonal boron nitride (hBN) or Ir(111), gives rise to a complex landscape of sublattice symmetry-breaking potentials for the Dirac fermions. Whereas a gap at the Dirac point opens for perfectly lattice-matched graphene on hBN, we show that the small lattice incommensurability prevents the opening of this gap and rather leads to a renormalized Dirac dispersion with a trigonal warping. This warping breaks the effective time-reversal symmetry in a single valley. On top of this an additional set of massless Dirac fermions is generated, which is characterized by a group velocity that is about half the one of pristine graphene.Keywords
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