Direct observation of a dispersionless impurity band in hydrogenated graphene

Autor(en)

Danny Haberer, Luca Petaccia, Mani Farjam, Simone Taioli, S. A. Jafari, Alexei Nefedov, Wu Zhang, Lucia Calliari, G. Scarduelli, Balazs Dora, D.V. Vyalikh, Thomas Pichler, Christof Wöll, Dario Alfe, Stefano Simonucci, Mildred S. Dresselhaus, Martin Knupfer, Bernd Büchner, Alexander Grüneis

Abstrakt

We show with angle-resolved photoemission spectroscopy that a new energy band appears in the electronic structure of electron-doped hydrogenated monolayer graphene (H-graphene). Its occupation can be controlled with the hydrogen amount and allows for tuning of graphene's doping level. Our calculations of the electronic structure of H-graphene suggest that this state is largely composed of hydrogen 1s orbitals and remains extended for low H coverages despite the random chemisorption of H. Further evidence for the existence of a hydrogen state is provided by x-ray absorption studies of undoped H-graphene which are clearly showing the emergence of an additional state in the vicinity of the pi* resonance.

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Elettra Sincrotrone Trieste, Institute for Research in Fundamental Sciences (IPM), Università degli Studi di Trento, Karlsruher Institut für Technologie, University of Science and Technology of China (USTC), Budapest University of Technology and Economics, Technische Universität Dresden, University College London, Università degli Studi di Camerino, Massachusetts Institute of Technology

Journal

Physical Review B

Band

83

Anzahl der Seiten

6

ISSN

1098-0121

DOI

https://doi.org/10.1103/PhysRevB.83.165433

Publikationsdatum

2011

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/226cf456-1132-41b4-a878-6a2567deebe5