Superconducting transport in InAs nanowire double quantum dots
Abstract
Quantum dot arrays in narrow-gap semiconductors coupled to superconducting reservoirs can serve as a platform for studying the interaction between solitary spins and the Cooper pair condensate, which can give rise to topologically protected Majorana modes. We define double quantum dots (DQDs) in InAs nanowires with epitaxial aluminum shell. We demonstrate that we can reach both the strongly and weakly coupled regimes owing to the five wrap-around electrostatic gates on the nanowire. We characterize the Josephson coupling via the DQD as a function of the charge occupation of the islands, and find abrupt changes which are possible experimental signatures of the change in the ground state spin configuration of the device. Finite voltage bias spectroscopy reveals Yu-Shiba-Rusinov states below the superconducting gap exhibiting the weakly and strongly coupled behavior at different gate configurations.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..MARV11004B