Wave-function engineering on superconducting substrates: Chiral Yu-Shiba-Rusinov molecules

Abstract

Magnetic adatoms on superconductors give rise to Yu-Shiba-Rusinov (YSR) states that hold considerable interest for the design of topological superconductivity. Here, we show that YSR states are also an ideal platform to engineer structures with intricate wave-function symmetries. We assemble structures of iron atoms on the quasi-two-dimensional superconductor $2H$-NbSe${}_2$. The Yu-Shiba-Rusinov wave functions of individual atoms extend over several nanometers enabling hybridization even at large adatom spacing. We show that the substrate can be exploited to deliberately break symmetries of the adatom structure in ways unachievable in the gas phase. We highlight this potential by designing chiral wave functions of triangular adatom structures confined within a plane. Our results significantly expand the range of interesting quantum states that can be engineered using arrays of magnetic adatoms on superconductors.

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Cited by in corpus (8)

• Diluted Yu-Shiba-Rusinov arrays on the $\beta$-Bi${}_2$Pd anisotropic superconductor
• Magnetic flux induced higher-order topological superconductivity
• Charge-density-wave control by adatom manipulation and its effect on magnetic nanostructures
• Properties of multiterminal superconducting nanostructure with double quantum dot
• Scalable Effective Models for Superconducting Nanostructures: Applications to Double, Triple, and Quadruple Quantum Dots
• Direct signatures of $d$-level hybridization and dimerization in magnetic adatom chains on a superconductor
• Odd-parity ground state in dilute Yu-Shiba-Rusinov dimers and chains
• Transient triplet blockade in Andreev junction