Broken symmetries, zero-energy modes, and quantum transport in disordered graphene: From supermetallic to insulating regimes

Alessandro Cresti, Frank Ortmann, Thibaud Louvet, Dinh Van Tuan, Stephan Roche

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59 Scopus citations

Abstract

The role of defect-induced zero-energy modes on charge transport in graphene is investigated using Kubo and Landauer transport calculations. By tuning the density of random distributions of monovacancies either equally populating the two sublattices or exclusively located on a single sublattice, all conduction regimes are covered from direct tunneling through evanescent modes to mesoscopic transport in bulk disordered graphene. Depending on the transport measurement geometry, defect density, and broken sublattice symmetry, the Dirac-point conductivity is either exceptionally robust against disorder (supermetallic state) or suppressed through a gap opening or by algebraic localization of zero-energy modes, whereas weak localization and the Anderson insulating regime are obtained for higher energies. These findings clarify the contribution of zero-energy modes to transport at the Dirac point, hitherto controversial.

Original languageEnglish
Article number196601
JournalPhysical Review Letters
Volume110
Issue number19
DOIs
StatePublished - 7 May 2013
Externally publishedYes

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