Coupled Yu-Shiba-Rusinov States Induced by a Many-Body Molecular Spin on a Superconductor

Authors:
Publisher website
Google Scholar
Abstract
A magnetic impurity on a superconductor induces Yu-Shiba-Rusinov (YSR) bound states, detected by tunneling spectroscopy as long-lived quasiparticle excitations inside the superconducting gap. Coupled YSR states constitute basic elements to engineer artificial superconducting states, but their substrate-mediated interactions are generally weak. In this Letter, we report that intramolecular (Hund’s-like) exchange interactions produce coupled YSR states across a molecular platform. We measured YSR spectra along a magnetic iron-porphyrin on Pb(111) and found evidence of two distinct interaction channels, which invert their particle-hole asymmetry across the molecule. Numerical calculations show that the identical YSR asymmetry pattern of the two channels is caused by two spin-hosting orbitals with opposite potential scattering and coupled strongly. Both channels can be similarly excited by tunneling electrons into each orbital, depicting a new scenario for entangled superconducting bound states using molecular platforms.
Funding Information
  • Agencia Estatal de Investigación
  • European Regional Development Fund
  • European Commission
  • Horizon 2020 Framework Programme (863098)
  • H2020 Marie Skłodowska-Curie Actions (844271)
  • The Slovenian Research and Innovation Agency
  • Maria de Maeztu Units of Excellence Programme (MDM-2016-0618)

This publication has 49 references indexed in Scilit: