Diluted Yu-Shiba-Rusinov arrays on the $\beta$-Bi${}_2$Pd anisotropic superconductor

Abstract

Magnetic adatoms on s-wave superconductors induce bound states inside the superconducting gap, called Yu-Shiba-Rusinov states (YSR). The anisotropy of the Fermi surface determines the spatial extension of bound states in a quasi-two-dimensional superconductor. This is especially important in the diluted impurity limit since the orbital overlap determines the coupling of YSR states of neighboring atoms and the formation of the collective YSR system. Here, we build diluted arrays of Mn atoms with different dimensionalities on the surface of $\beta$-Bi${}_2$Pd, and we measure the evolution of their YSR spectra with the structure. We detect the coupling as a split of YSR peaks in subgap spectra and find that the split size increases with the number of atoms. The orientation of the structures along different directions of the \bipd substrate modulates the split and particle-hole asymmetry of the YSR states due to the anisotropic character of the Fermi surface, captured by the Green function model. With the aid of the model, we found multiple YSR excitations in an extended 2D array of 25 Mn atoms, and we identified that their spatial distribution reflects a chiral LDOS.

10 pages, 5 figures

References in corpus (22)

• Diode effect in Josephson junctions with a single magnetic atom
• Orbital Picture of Yu-Shiba-Rusinov Multiplets
• Evidence of topological Shiba bands in artificial spin chains on superconductors
• Controlled length-dependent interaction of Majorana modes in Yu-Shiba-Rusinov chains
• Properties of anisotropic magnetic impurities on surfaces
• Spin-polarized Yu-Shiba-Rusinov states in an iron based superconductor
• Superconductivity at 5.4 K in $\beta$-Bi${}_2$Pd
• Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers
• Quantum spins and hybridization in artificially-constructed chains of magnetic adatoms on a superconductor
• Two-dimensional Shiba lattices as possible platform for crystalline topological superconductivity
• Tuning interactions between spins in a superconductor
• Impurity-induced bound states in superconductors with spin-orbit coupling
• Yu-Shiba-Rusinov states in real metals
• Atomic Manipulation of In-gap States on the $\beta$-Bi${}_2$Pd Superconductor
• Pair excitations of a quantum spin on a proximitized superconductor
• Coupling of Yu-Shiba-Rusinov states in 1D chains of Fe atoms on Nb(110)
• Yu-Shiba-Rusinov states in 2D superconductors with arbitrary Fermi contours
• Wave-function engineering on superconducting substrates: Chiral Yu-Shiba-Rusinov molecules
• Yu-Shiba-Rusinov bands in a self-assembled kagome lattice of magnetic molecules
• Quasiparticle focusing of bound states in two-dimensional $s$-wave superconductors
• Calculations of in-gap states of ferromagnetic spin chains on \textit{s}-wave wide-band superconductors
• Quantifying the quantum nature of high spin YSR excitations in transverse magnetic field

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