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

Chen Si, Zheng Liu, Wenhui Duan, and Feng Liu
Phys. Rev. Lett. 111, 196802 – Published 6 November 2013
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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 (4×1014cm2) and strain (16%) levels, the superconducting critical temperature Tc is estimated to be as high as 30K, the highest for a single-element material above the liquid hydrogen temperature.

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  • Received 13 June 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.196802

© 2013 American Physical Society

Authors & Affiliations

Chen Si1,2, Zheng Liu2, Wenhui Duan1, and Feng Liu2,*

  • 1Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, People’s Republic of China
  • 2Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA

  • *fliu@eng.utah.edu

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Issue

Vol. 111, Iss. 19 — 8 November 2013

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