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  • Letter
  • Open Access

Josephson current via spin and orbital states of a tunable double quantum dot

Rousan Debbarma1, Markus Aspegren1, Florinda Viñas Boström1,3, Sebastian Lehmann1, Kimberly Dick2, and Claes Thelander1,*

  • 1Division of Solid State Physics and NanoLund, Lund University, Box 118, S-221 00 Lund, Sweden
  • 2Center for Analysis and Synthesis, Lund University, Box 124, S-221 00 Lund, Sweden
  • 3Institut für Mathematische Physik, Technische Universität Braunschweig, D-38106 Braunschweig, Germany

  • *claes.thelander@ftf.lth.se
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Phys. Rev. B 106, L180507 – Published 28 November, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L180507

Abstract

Supercurrent transport is experimentally studied in a Josephson junction hosting a double quantum dot (DQD) with tunable symmetries. The QDs are parallel coupled to two superconducting contacts and can be tuned between strong interdot hybridization and a ring geometry where hybridization is suppressed. In both cases, we observe supercurrents when the two interacting orbitals are either empty or filled with spins, or a combination. However, when each QD hosts an unpaired spin, the supercurrent depends on the spin ground state. It is strongly suppressed for the ring geometry with a spin-triplet ground state at zero external magnetic field. By increasing the QD hybridization, we find that a supercurrent appears when the ground state changes to spin singlet. In general, supercurrents are suppressed in cases of spin-doublet ground state, but an exception occurs at orbital degeneracy when the system hosts one additional spin, as opposed to three, pointing to a broken particle-hole symmetry.

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Outline

Information

Phys. Rev. B 106, L180507– Published 28 November, 2022
  • Received 6 September 2022
  • Revised 4 November 2022
  • Accepted 8 November 2022
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by Bibsam.

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