January 19, 2017

p-wave triggered superconductivity in single-layer graphene on an electron-doped oxide superconductor

  • Alpern H.
  • Amado M.
  • Barbone M.
  • De Fazio D.
  • Di Bernardo A.
  • Ferrari A.
  • Kalcheim Y.
  • Linder J.
  • Millo O.
  • Ott A.
  • Robinson J.
  • Sassi U.
  • Yoon D.

Electron pairing in the vast majority of superconductors follows the Bardeen-Cooper- Schrieffer theory of superconductivity, which describes the condensation of electrons into pairs with antiparallel spins in a singlet state with an s-wave symmetry. Unconventional superconductivity was predicted in single-layer graphene (SLG), with the electrons pairing with a p-wave or chiral d-wave symmetry, depending on the position of the Fermi energy with respect to the Dirac point. By placing SLG on an electron-doped (non-chiral) d-wave superconductor and performing local scanning tunnelling microscopy and spectroscopy, here we show evidence for a p-wave triggered superconducting density of states in SLG. The realization of unconventional superconductivity in SLG offers an exciting new route for the development of p-wave superconductivity using two-dimensional materials with transition temperatures above 4.2 K.

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