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

被引：40

作者：

Altenburg, S. J. ^{[1
]}

Kroeger, J. ^{[2
]}

Wehling, T. O. ^{[3
]}

Sachs, B. ^{[3
]}

Lichtenstein, A. I. ^{[3
]}

Berndt, R. ^{[1
]}

机构：

[1] Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany

[2] Tech Univ Ilmenau, Inst Phys, D-98693 Ilmenau, Germany

[3] Univ Hamburg, Inst Theoret Phys 1, D-20355 Hamburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 20期

关键词：

SCANNING TUNNELING MICROSCOPE; AUGMENTED-WAVE METHOD; ULTRASOFT PSEUDOPOTENTIALS; METAL-SURFACES; SPECTROSCOPY; DISPERSIONS; STATES;

D O I：

10.1103/PhysRevLett.108.206805

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 -160 meV 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.

引用

页数：5

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