Phys. Rev. B 76, 205122 (2007) [5 pages]Coulomb impurity in grapheneReceived 12 July 2007; published 28 November 2007 We consider the problem of screening of an electrically charged impurity in a clean graphene sheet. When electron-electron interactions are neglected, the screening charge has a sign opposite to that of the impurity and is localized near the impurity. Interactions between electrons smear out the induced charge density to give a large-distance tail that follows approximately, but not exactly, an r−2 behavior and with a sign which is the same as that of the impurity. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.205122
DOI:
10.1103/PhysRevB.76.205122
PACS:
73.63.Bd, 05.10.Cc
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