Impact of Andreev Bound States within the Leads of a Quantum Dot Josephson Junction
Alberto Bordin (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab)
Florian J. Bennebroek Evertsz (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)
Gorm O. Steffensen (Instituto de Ciencia de Materiales de Madrid (ICMM), Universidad Autónoma de Madrid)
Tom Dvir (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - Qubit Research Division)
Grzegorz P. Mazur (TU Delft - QRD/Wimmer Group, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
David Van Driel (TU Delft - Business Development, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
Nick Van Loo (Kavli institute of nanoscience Delft, Student TU Delft)
Jan Cornelis Wolff (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre)
Leo P. Kouwenhoven (TU Delft - QN/Kouwenhoven Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab)
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Abstract
Detection and control of Andreev bound states (ABSs) localized at semiconductor-superconductor interfaces are essential for their use in quantum applications. Here we investigate the impact of ABSs on the supercurrent through a Josephson junction containing a quantum dot (QD). Additional normal-metal tunneling probes on both sides of the junction unveil the ABSs residing at the semiconductor-superconductor interfaces. Such knowledge provides an ingredient missing in previous studies, improving the connection between theory and experimental data. By varying the ABS energies using electrostatic gates, we show control of the switching current, with the ability to alter it by more than an order of magnitude. Finally, the large degree of ABS tunability allows us to realize a three-site Andreev molecule in which the central QD is screened by both ABSs. This system is studied simultaneously using both supercurrent and spectroscopy.
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