1205.1999 (S. J. Altenburg et al.)

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

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

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.

View original: http://arxiv.org/abs/1205.1999