Direct observation of a dispersionless impurity band in hydrogenated graphene

作者：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; Woell Ch; Alfe D; Simonucci S; Dresselhaus M S; Knupfer M; Buechner B; Grueneis A

来源：Physical Review B, 2011, 83(16): 165433.

DOI：10.1103/PhysRevB.83.165433

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.

• 出版日期2011-4-22
• 单位中国科学技术大学