Electron-hole asymmetry in two-terminal graphene devices

Wolf-Ruediger Hannes, M. Jonson, M. Titov

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

A theoretical model is proposed to describe asymmetric gate-voltage dependence of conductance and noise in two-terminal ballistic graphene devices. The model is analyzed independently within the self-consistent Hartree and Thomas-Fermi approximations. Our results justify the prominent role of metal contacts in recent experiments with suspended graphene flakes. The contact-induced electrostatic potentials in graphene demonstrate a power-law decay, with the exponent varying from -1 to -0.5. Within our model we explain electron-hole asymmetry and strong Fabri-Perot oscillations of the conductance and noise with positive doping, which were observed in many experiments with submicrometer samples. Limitations of the Thomas-Fermi approximation in a vicinity of the Dirac point are discussed.

Original languageEnglish
Pages (from-to)045414-1-045414-7
Number of pages7
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume84
Issue number4
DOIs
Publication statusPublished - 7 Jul 2011

Keywords

  • BALLISTIC TRANSPORT
  • CONTACT

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