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Phys Rev Lett. 2013 Nov 8;111(19):196802. Epub 2013 Nov 6.

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

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  • 1Department 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.

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.

PMID:
24266482
[PubMed]
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