2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/142987We 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.10 pages, 3 figures; (v2) Corrected sign error in Eq. (13); (v3) corrected figuresStrongly Correlated ElectronsHigh Energy Physics - Theorytext