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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
Author(s):
 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
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 Ï* resonance.

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