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Direct observation of a dispersionless impurity band in hydrogenated graphene

Haberer, D ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevB.83.165433
  3. Abstract:
  4. 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
  5. Keywords:
  7. Source: Physical Review B - Condensed Matter and Materials Physics ; Volume 83, Issue 16 , 2011 ; 10980121 (ISSN)
  8. URL: http://journals.aps.org/prb/abstract/10.1103/PhysRevB.83.165433