Session Z14: Graphene: Adsorbates and Defects
11:15 AM–2:03 PM, Friday, March 19, 2010
Room: B113
Sponsoring Units:
DMP DCMP
Chair: Bobby Sumpter, Oak Ridge National Laboratory
Abstract ID: BAPS.2010.MAR.Z14.9
Abstract: Z14.00009 : Absence of a supercritical regime induced by short-range impurity scattering in gapped graphene
12:51 PM–1:03 PM
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Abstract 
Authors:
Stepan Grinek
(University of Alberta)
Zhou Lie
Jie Chen
Qinwei Shi
Frank Marsiglio
We show that the changes in the electronic density of states (DOS) in graphene induced by impurity scattering with short-range potentials are completely different from those caused by the long-range Coulomb potential. The spectral weight of the state that eventually disappears into the valence band (as the strength of scattering increases) does not transform into a resonance state. Therefore no unusual screening effects related to a redistribution of the density of states in the valence band are observed. The states induced by the short-range impurities in graphene, therefore, have distinctively different properties compared with the long-range potential case. These properties, in fact, closely resemble the case of a short-range single impurity in other bipartite lattices, such as the square, body centered cubic, and simple cubic lattices.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.Z14.9