Coulomb impurity in graphene

[摘要] 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.

[发布日期] 2007-11-01

[关键词] FERMI-LIQUID BEHAVIOR