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

ORAL

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 ($\sim4\times10^{14}$ cm$^{-2}$) and strain ($\sim16$\%) levels, the superconducting critical temperature $T_{c}$ is estimated as high as $\sim30$ K, the highest for a single-element material above the liquid hydrogen temperature.

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Authors

  • Chen Si

    Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China

  • Zheng Liu

    Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA

  • Wenhui Duan

    Tsinghua University, Department of Physics, State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Dept. of Phys. and State Key Lab of Low-Dimensional Quantum Physics, Tsinghua Univ., Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China, Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University

  • Feng Liu

    Department of Materials Science and Engineering, University of Utah, University of Utah, Univ of Utah, Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA