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

2012/05/09 by S. J. Altenburg, J. Kröger, Altenburg, S. J. +9
Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #cond-mat.mes-hall

paper · pdf · doi:10.48550/arxiv.1205.1999

Accepted by Physical Review Letters, Feb 17, 2012

arxiv created 2012/05/09 · arxiv updated 2012/05/10

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.

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