Coulomb impurity in graphene
نویسنده
چکیده
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 largedistance tail that follows approximately, but not exactly, an r behavior and with a sign which is the same as that of the impurity.
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