Magnetic-related States and Order Parameter Induced in a Conventional Superconductor by Nonmagnetic Chiral Molecules

Hen Alpern, Konstantin Yavilberg, Tom Dvir, Nir Sukenik, Maya Klang, Shira Yochelis, Hagai Cohen, Eytan Grosfeld, Hadar Steinberg, Yossi Paltiel*, Oded Millo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Hybrid ferromagnetic/superconducting systems are well-known for hosting intriguing phenomena such as emergent triplet superconductivity at their interfaces and the appearance of in-gap, spin-polarized Yu-Shiba-Rusinov (YSR) states bound to magnetic impurities on a superconducting surface. In this work we demonstrate that similar phenomena can be induced on a surface of a conventional superconductor by chemisorbing nonmagnetic chiral molecules. Conductance spectra measured on NbSe2 flakes over which chiral α-helix polyalanine molecules were adsorbed exhibit, in some cases, in-gap states nearly symmetrically positioned around zero bias that shift with magnetic field, akin to YSR states, as corroborated by theoretical simulations. Other samples show evidence for a collective phenomenon of hybridized YSR-like states giving rise to unconventional, possibly triplet superconductivity, manifested in the conductance spectra by the appearance of a zero bias conductance that diminishes, but does not split, with magnetic field. The transition between these two scenarios appears to be governed by the density of adsorbed molecules.

Original languageAmerican English
Pages (from-to)5167-5175
Number of pages9
JournalNano Letters
Volume19
Issue number8
DOIs
StatePublished - 14 Aug 2019

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.

Keywords

  • NbSe
  • YSR states
  • chiral molecules
  • superconductivity

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