Local Gating of an Ir(111) Surface Resonance by Graphene Islands

S. J. Altenburg; J. Kröger; T. O. Wehling; B. Sachs; A. I. Lichtenstein; R. Berndt

Local Gating of an Ir(111) Surface Resonance by Graphene Islands

Mesoscale and Nanoscale Physics 2012-05-10 v1

Authors: S. J. Altenburg , J. Kröger , T. O. Wehling , B. Sachs , A. I. Lichtenstein , R. Berndt

Abstract

The influence of graphene islands on the electronic structure of the Ir(111) surface is investigated. Scanning tunneling spectroscopy (STS) indicates the presence of a two-dimensional electron gas with a binding energy of -160meV and an effective mass of -0.18m_e underneath single-layer graphene on the Ir(111) surface. Density functional calculations reveal that the STS features are predominantly due to a holelike surface resonance of the Ir(111) substrate. Nanometer-sized graphene islands act as local gates, which shift and confine the surface resonance.

Keywords

graphene islands Ir(111) surface surface resonance local gating scanning tunneling spectroscopy two-dimensional electron gas density functional theory

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@article{arxiv.1205.1999,
  title  = {Local Gating of an Ir(111) Surface Resonance by Graphene Islands},
  author = {S. J. Altenburg and J. Kröger and T. O. Wehling and B. Sachs and A. I. Lichtenstein and R. Berndt},
  journal= {arXiv preprint arXiv:1205.1999},
  year   = {2012}
}

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Accepted by Physical Review Letters, Feb 17, 2012

Local Gating of an Ir(111) Surface Resonance by Graphene Islands

Abstract

Keywords

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