Unconventional superconductivity induced in Nb films by adsorbed chiral molecules

H. Alpern, E. Katzir, S. Yochelis, N. Katz, Y. Paltiel, O. Millo

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29 Scopus citations

Abstract

Motivated by recent observations of chiral-induced magnetization and spin-selective transport we studied the effect of chiral molecules on conventional BCS superconductors. By applying scanning tunneling spectroscopy, we demonstrate that the singlet-pairing s-wave order parameter of Nb is significantly altered upon adsorption of chiral polyalanine alpha-helix molecules on its surface. The tunneling spectra exhibit zero-bias conductance peaks embedded inside gaps or gap-like features, suggesting the emergence of unconventional triplet-pairing components with either d-wave or p-wave symmetry at the Nb organic-molecules interface, as corroborated by simulations. These results may open a way for realizing simple superconducting spintronics devices.

Original languageAmerican English
Article number113048
JournalNew Journal of Physics
Volume18
Issue number11
DOIs
StatePublished - Nov 2016

Bibliographical note

Publisher Copyright:
© 2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

Keywords

  • chiral molecules
  • scanning tunneling spectroscopy
  • triplet superconductivity

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