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-nonde...

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Detalhes bibliográficos
Autores: Zaldívar, Javier, Ortuzar, Jon, Alvarado, Miguel, Trivini, Stefano, Baumard, Julie, Rubio-Verdú, Carmen, Herrera, Edwin, Suderow, Hermann, Levy Yeyati, Alfredo, Bergeret, F. Sebastian, Pascual, José I.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/405803
Acesso em linha:http://hdl.handle.net/10261/405803
Access Level:acceso abierto
Descrição
Resumo: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 −Bi2⁢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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