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August 13, 2012Physical Review BOpen Access

Graphene on incommensurate substrates: Trigonal warping and emerging Dirac cone replicas with halved group velocity

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Authors

COCarmine OrtixUniversity of SalernoLYLi‐Ping YangNortheast Normal UniversityJBJeroen van den BrinkLeibniz Institute for Solid State and Materials Research

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Implication

Theoretical analysis reveals trigonal warping and halved-velocity Dirac cone replicas in graphene on incommensurate substrates, indicating preserved gapless electronic dispersion.

Key Points

  • To investigate the electronic structure and dispersion modifications of Dirac fermions in graphene placed on slightly lattice-mismatched, incommensurate substrates.
  • Modeled the sublattice symmetry-breaking potential landscape in graphene deposited on incommensurate substrates such as hexagonal boron nitride (hBN) and Ir(111).
  • Lattice incommensurability suppresses the bandgap opening observed in perfectly matched systems, instead inducing a renormalized Dirac dispersion with trigonal warping.
  • Induced trigonal warping breaks effective single-valley time-reversal symmetry.
  • An emerging secondary set of massless Dirac fermions is generated with a group velocity approximately half that of pristine graphene.

Cite This Study

Ortix et al. (2012) studied this question.

synapsesocial.com/papers/6a76231f8802f13c0e613ff2https://doi.org/10.1103/physrevb.86.081405
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