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“School of Nano-Sciences”

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Paper   IPM / Nano-Sciences / 12106
School of Nano Science
  Title:   Direct observation of a dispersioness impurity band in haydrogenated graphene
1 . D. Haberer
2 . L. Petaccia
3 . Mani 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. Vyanlikh
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
  No.:  16
  Vol.:  83
  Year:  2011
  Pages:   6
  Publisher(s):   American Physical Society
  Supported by:  IPM
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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