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Paper   IPM / Physic / 12122
School of Physics
  Title:   Direct Observation of a Dispersionless Impurity Band in Hydrogenated Graphene
  Author(s): 
1.  D. Haberer
2.  L. Petaccia
3.  M. Farjam
4.  S. Taioli
5.  S.A. Jafari
6.  A. Nefedov
7.  W. Zhang
8.  L. Calliari
9.  G. Scarduelli
10.  B. Dora
11.  D.V. Vyalikh
12.  T. Pichler
13.  Ch. Woll
14.  D. Alfe
15.  S. Simonucci
16.  M.S. Dresselhaus
17.  M. Knupfer
18.  B. Buchner
19.  A. Gruneis
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  83
  Year:  2011
  Pages:   165433
  Supported by:  IPM
  Abstract:
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 Π* resonance.

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