Coupling of Yu-Shiba-Rusinov states in 1D chains of Fe atoms on Nb(110)

Abstract

The hybridization of Yu-Shiba-Rusinov states in dimers of magnetic impurities leads to molecular-like bonding and antibonding modes. In many-impurity systems, the interaction gives rise to YSR bands and can even result in the formation of a topologically non-trivial superconducting state, characterized by Majorana fermions at the edges of the system. To obtain a more detailed understanding of these interactions, we investigate the coupling of YSR states in short one-dimensional Fe chains on clean Nb(110). We observe a splitting of the single-atom YSR peaks into multiple states with even or odd spatial symmetry and identify a peculiar dependence of the even and odd states' energy position on the chain length.

7 pages, 4 figures

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• Systematic study of Mn atoms, artificial dimers and chains on superconducting Ta(110)
• Boosting the STM's spatial and energy resolution with double-functionalized probe tips
• Diamagnetic property and optical absorption in conventional superconductors with magnetic impurities
• Shiba states in systems with density of states singularities
• Diluted Yu-Shiba-Rusinov arrays on the $\beta$-Bi${}_2$Pd anisotropic superconductor
• Gate-tunable topological superconductivity in a supramolecular electron spin lattice
• Odd-parity ground state in dilute Yu-Shiba-Rusinov dimers and chains
• Fermi-Level Pinning of Yu-Shiba-Rusinov States in a Superconductor with Weakly Broken Spin-Rotational Invariance
• Kondo Screening and Indirect Magnetic Exchange through a Conventional Superconductor Studied by the Density-Matrix Renormalization Group
• Direct signatures of $d$-level hybridization and dimerization in magnetic adatom chains on a superconductor