First-Principles Calculations on the Effect of Doping and Biaxial Tensile Strain on Electron-Phonon Coupling in Graphene

Chen Si, Zheng Liu, Wenhui Duan, Feng Liu
2013 Physical Review Letters  
Graphene has exhibited a wealth of fascinating properties, but is also known not to be a superconductor. Remarkably, we show that graphene can be made a conventional Bardeen-Cooper-Schrieffer superconductor by the combined effect of charge doping and tensile strain. While the effect of doping obviously enlarges the Fermi surface, the effect of strain profoundly increases the electron-phonon coupling. At the experimental accessible doping ($ 4 Â 10 14 cm À2 ) and strain ( $ 16%) levels, the
more » ... conducting critical temperature T c is estimated to be as high as $30 K, the highest for a single-element material above the liquid hydrogen temperature.
doi:10.1103/physrevlett.111.196802 pmid:24266482 fatcat:dtfbb4qfpfdy7p2vnsocs53jk4