Coupled Yu-Shiba-Rusinov states induced by a many-body molecular spin on a superconductor

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 paper, 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 evidences of two orbital 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.

6 pages, 5 figures, This document is the Author's version of an Accepted Work, copyright American Physical Society

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Cited by in corpus (19)

• Yu-Shiba-Rusinov states in real metals
• Pair excitations of a quantum spin on a proximitized superconductor
• Quantum Yu-Shiba-Rusinov dimers
• Resonance-enhanced vibrational spectroscopy of molecules on a superconductor
• Extending the spin excitation lifetime of a magnetic molecule on a proximitized superconductor
• Magnetic moment preservation and emergent Kondo resonance of Co-phthalocyanine on semimetallic Sb(111)
• Yu-Shiba-Rusinov states in 2D superconductors with arbitrary Fermi contours
• Electric field tuning of magnetic states in single magnetic molecules
• Effect of Van Hove singularities on Shiba states in two-dimensional $s$-wave superconductors
• Quantum phase transition in magnetic nanographenes on a lead superconductor
• Theory of a Single Magnetic Impurity on a Thin Metal Film in Proximity to a Superconductor
• Quantum spin driven Yu-Shiba-Rusinov multiplets and fermion-parity-preserving phase transition in K${}_3$C${}_{60}$
• Shiba states in systems with density of states singularities
• Study of Yu-Shiba-Rusinov bound states by tuning the electron density at the Fermi energy
• Yu-Shiba-Rusinov states, the BCS-BEC crossover, and the exact solution in the flat-band limit
• Diluted Yu-Shiba-Rusinov arrays on the $\beta$-Bi${}_2$Pd anisotropic superconductor
• Control of Andreev Reflection via a Single-Molecule Orbital
• Preparation and readout of Majorana qubits in magnet-superconductor hybrid systems
• Sub-gap Fano resonances in a topological superconducting wire with on-site Coulomb interactions