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 work, 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.
@article{arxiv.2008.04375,
title = {Triplet-blockaded Josephson supercurrent in double quantum dots},
author = {Daniël Bouman and Ruben J. J. van Gulik and Gorm Steffensen and Dávid Pataki and Péter Boross and Peter Krogstrup and Jesper Nygård and Jens Paaske and András Pályi and Attila Geresdi},
journal= {arXiv preprint arXiv:2008.04375},
year = {2021}
}
Comments
Published version. Supplementary Information is available as ancillary file, raw data and calculations can be downloaded from https://doi.org/10.5281/zenodo.3978236