Bandgap formation in graphene on Ir(111) through oxidation

Summary, in English

A graphene monolayer on single crystal Ir(111) has been studied using angle-resolved photoemission spectroscopy (ARPES) before and after exposure to atomic oxygen. With increasing oxygen coverage the Dirac cone, centered on the K-point of the Brillouin zone, broadens and finally transforms to a parabolic rather than linear feature, introducing a pronounced energy bandgap at the Fermi level. The opening of a bandgap of at least 0.35 eV was observed at the oxygen exposure close to the saturation coverage. (C) 2012 Elsevier B. V. All rights reserved.

• Författare: Karina Schulte; Nikolay Vinogradov; May Ling Ng; Nils Mårtensson; Alexei Preobrajenski
• Avdelning/ar: MAX IV-laboratoriet
• Publiceringsår: 2013
• Språk: Engelska
• Sidor: 74-76
• Publikation/Tidskrift/Serie: Applied Surface Science
• Volym: 267
• Länkar: http://dx.doi.org/10.1016/j.apsusc.2012.07.122
• Dokumenttyp: Artikel i tidskrift
• Förlag: Elsevier
• Ämne: Natural Sciences; Physical Sciences
• Nyckelord: Graphene; Oxidation; Electronic structure: photoelectron spectroscopy; Adsorbates: binding site geometry; Electronic structure
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 1873-5584