Revealing Band-Hybrid Cooper Pairs on the Surface of a Superconductor with Spin-Orbit Coupling
Javier Zaldívar, Jon Ortuzar, Miguel Alvarado, Stefano Trivini, Julie Baumard, Carmen Rubio-Verdú, Edwin Herrera, Hermann Suderow, Alfredo Levy Yeyati, F. Sebastian Bergeret, Jose Ignacio Pascual
DOI 10.1103/6jfy-cv89 · Physical Review Letters
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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−Bi2Pd. 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Pd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.4 | Pressure not reported | onset |
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