Singlet and triplet Cooper pair splitting in hybrid superconducting nanowires

Guanzhong Wang, Tom Dvir*, Grzegorz P. Mazur, Chun Xiao Liu, Nick van Loo, Sebastiaan L.D. ten Haaf, Alberto Bordin, Sasa Gazibegovic, Ghada Badawy, Erik P.A.M. Bakkers, Michael Wimmer, Leo P. Kouwenhoven

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)
10 Downloads (Pure)

Abstract

In most naturally occurring superconductors, electrons with opposite spins form Cooper pairs. This includes both conventional s-wave superconductors such as aluminium, as well as high-transition-temperature, d-wave superconductors. Materials with intrinsic p-wave superconductivity, hosting Cooper pairs made of equal-spin electrons, have not been conclusively identified, nor synthesized, despite promising progress1–3. Instead, engineered platforms where s-wave superconductors are brought into contact with magnetic materials have shown convincing signatures of equal-spin pairing4–6. Here we directly measure equal-spin pairing between spin-polarized quantum dots. This pairing is proximity-induced from an s-wave superconductor into a semiconducting nanowire with strong spin–orbit interaction. We demonstrate such pairing by showing that breaking a Cooper pair can result in two electrons with equal spin polarization. Our results demonstrate controllable detection of singlet and triplet pairing between the quantum dots. Achieving such triplet pairing in a sequence of quantum dots will be required for realizing an artificial Kitaev chain7–9.

Original languageEnglish
Pages (from-to)448-453
Number of pages6
JournalNature
Volume612
Issue number7940
DOIs
Publication statusPublished - 2022

Bibliographical note

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Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

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