[seminar] seminar na IF-u, 30. lipnja 2011. u 15:00 h

[Vlasta Horvatic]

      Institut za fiziku, Bijenicka cesta 46,

      predavaonica u zgradi Mladen Paic

      cetvrtak, 30. lipnja 2011., u 15:00 sati
     
      Unoccupied electronic states in graphene systems
     
      Dr. Vyacheslav M. Silkin 
     
       

      Donostia International Physics Center (D.I.P.C.), 

      Departamento de Física de Materiales, Universidad del País Vasco, San Sebastian, Spain 

      IKERBASQUE, Basque Foundation for Science, Bilbao, Spain

      E-mail: waxslavs at ehu.es 
     
      Recently it has been shown that polarization of a two-dimensional graphene sheet by an external charge produces an attractive image potential that supports, in addition to the well-known p* bands, a double series of Rydberg-like image potential states converging towards the vacuum level. Being quantified in the perpendicular to the graphene sheet direction, in the parallel plane these states have nearly free electron character like similar states on metal surfaces. A large extension of wave function of image-potential states into the vacuum implies that they are very sensitive to any change of shape and environment of the graphene sheet. Thus the properties of these states can be modified by an external electric field and a shape/geometry variation. The lowest-energy members of such states have been experimentally observed in graphene sheets grown on some substrates. Some examples of such unoccupied electronic states in other carbon-based materials, like graphite, multilayer graphene, fullerenes, and nanotubes, as having common origin with the graphene image-potential states will be presented.

       

      http://dipc.ehu.es/group/index.htm
     
       

       

      Voditelji seminara IF-a: Vlasta Horvatic i Ivica Zivkovic



       
     

 
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