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

doi:10.1103/PhysRevLett.111.196802

First-principles calculations on the effect of doping and biaxial tensile strain on electron-phonon coupling in graphene

Phys Rev Lett. 2013 Nov 8;111(19):196802. doi: 10.1103/PhysRevLett.111.196802. Epub 2013 Nov 6.

Authors

Chen Si¹, Zheng Liu, Wenhui Duan, Feng Liu

Affiliation

¹ Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, People's Republic of China and Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA.

PMID: 24266482
DOI: 10.1103/PhysRevLett.111.196802

Abstract

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 (~4×10(14) cm(-2)) and strain (~16%) levels, the superconducting 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.