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