Triplet-blockaded Josephson supercurrent in double quantum dots

Daniel Bouman, Ruben J. J. van Gulik, Gorm Steffensen, David Pataki, Peter Boross, Peter Krogstrup, Jesper Nygard, Jens Paaske, Andras Palyi, Attila Geresdi*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

20 Citations (Scopus)
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Abstract

Serial double quantum dots created in semiconductor nanostructures provide a versatile platform for investigating two-electron spin quantum states, which can be tuned by electrostatic gating and an external magnetic field. In this Rapid Communication, we directly measure the supercurrent reversal between adjacent charge states of an InAs nanowire double quantum dot with superconducting leads, in good agreement with theoretical models. In the even charge parity sector, we observe a supercurrent blockade with increasing magnetic field, corresponding to the spin singlet to triplet transition. Our results demonstrate a direct spin to supercurrent conversion, the superconducting equivalent of the Pauli spin blockade. This effect can be exploited in hybrid quantum architectures coupling the quantum states of spin systems and superconducting circuits.

Original languageEnglish
Article number220505
JournalPhysical Review B
Volume102
Issue number22
Number of pages6
ISSN2469-9950
DOIs
Publication statusPublished - 21 Dec 2020

Keywords

  • SPIN
  • SUPERCONDUCTORS
  • TRANSPORT

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