Revealing Band-Hybrid Cooper Pairs on the Surface of a Superconductor with Spin-Orbit Coupling

Most superconductors exhibit spin-singlet pairing within a single band. In multiband systems with strong spin-orbit coupling, more exotic scenarios can emerge, including Cooper pairs between bands with distinct symmetries. Here, we present evidence of the formation of Cooper pairs between spin-nondegenerate helical surface bands in the superconductor β-Bi_{2}Pd. Scanning tunneling microscopy reveals anisotropic Yu-Shiba-Rusinov (YSR) resonances induced by vanadium impurities, with long-range amplitude modulations attributed to spin-conserving Bogoliubov quasiparticle interference (BQPI). Analysis of BQPI at the subgap YSR energy shows that only a selective subset of normal-state scattering processes contributes to Cooper pair formation, indicating interband mixing. We trace this selectivity to the hybridization of a helical surface band with others via the impurity.

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Publication Details

Journal
Physical Review Letters
Published
2025-09-23
DOI
https://doi.org/10.1103/6jfy-cv89
Citations
1
Primary Topic
Physics of Superconductivity and Magnetism
Type
article
Field-Weighted Citation Impact
1.26
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article

Revealing Band-Hybrid Cooper Pairs on the Surface of a Superconductor with Spin-Orbit Coupling

Hermann Suderow, Miguel Alvarado, José Ignacio Pascual, Stefano Trivini et al.
1 citations
Physical Review Letters
Physics of Superconductivity and Magnetism
1.26
article

Revealing Band-Hybrid Cooper Pairs on the Surface of a Superconductor with Spin-Orbit Coupling

Hermann Suderow, Miguel Alvarado, José Ignacio Pascual, Stefano Trivini, A. Levy Yeyati, Carmen Rubio-Verdú, Jon Ortuzar, Julie Baumard, F. S. Bergeret, Javier Zaldı́var, Edwin Herrera
article en
1 citations

Abstract

Most superconductors exhibit spin-singlet pairing within a single band. In multiband systems with strong spin-orbit coupling, more exotic scenarios can emerge, including Cooper pairs between bands with distinct symmetries. Here, we present evidence of the formation of Cooper pairs between spin-nondegenerate helical surface bands in the superconductor β-Bi_{2}Pd. Scanning tunneling microscopy reveals anisotropic Yu-Shiba-Rusinov (YSR) resonances induced by vanadium impurities, with long-range amplitude modulations attributed to spin-conserving Bogoliubov quasiparticle interference (BQPI). Analysis of BQPI at the subgap YSR energy shows that only a selective subset of normal-state scattering processes contributes to Cooper pair formation, indicating interband mixing. We trace this selectivity to the hybridization of a helical surface band with others via the impurity.

Physical Review LettersVol. 135(13)
Ikerbasque (ES), CIC nanoGUNE (ES), Instituto de Ciencia de Materiales de Madrid (ES), Material Physics Center (ES), Donostia International Physics Center (ES), Universidad Autónoma de Madrid (ES)
Openalex Percentile: Top 17%
Physics of Superconductivity and Magnetism
1.26
DOIOpen Access PDFOpenAlex
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Revealing Band-Hybrid Cooper Pairs on the Surface of a Superconductor with Spin-Orbit Coupling — Hermann Suderow, Miguel Alvarado, et al. · Physical Review Letters (2025) | TGRS Research Map | TGRS