Direct observation of a dispersionless impurity band in hydrogenated graphene
Author(s)Haberer, D.; Petaccia, L.; Farjam, M.; Taioli, S.; Jafari, S. A.; Nefedov, A.; Zhang, W.; Calliari, L.; Scarduelli, G.; Dora, B.; Vyalikh, D. V.; Pichler, T.; Woll, Ch.; Alfe, D.; Simonucci, S.; Dresselhaus, Mildred; Knupfer, M.; Buchner, B.; Gruneis, A.; ... Show more Show less
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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.
Departmentdelete; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Physics
Physical Review B
American Physical Society
Haberer, D. et al. “Direct observation of a dispersionless impurity band in hydrogenated graphene.” Physical Review B 83 (2011). ©2011 American Physical Society.
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