▎ 摘　　要

The structural, electronic, vibrational, and superconducting properties of alkali (K, Rb) and alkaline earth (Ca, Sr) metal-covered monolayer graphene have been investigated based on first-principles methods. We noticed that the different adatoms and their concentrations allow tuning of the electronic properties of carbon sheets, inducing the transition from semimetallic pristine graphene to metallic decorated graphene. Moreover, the phonon calculations confirm the dynamic stability of all systems studied, while the electron?phonon coupling calculations predict that the superconducting critical temperature of CaC8 can reach the highest value of 1.86 K. Our work shows the possibility of inducing and studying superconductivity in other metal-covered 2D materials.