Josephson Effect in a Few-Hole Quantum Dot
Joost Ridderbos (University of Twente)
Matthias Brauns (Institute of Science and Technology Austria, University of Twente)
Jie Shen (TU Delft - QRD/Kouwenhoven Lab)
Folkert K. de Vries (TU Delft - QRD/Kouwenhoven Lab)
Ang Li (Beijing University of Technology, Eindhoven University of Technology)
Erik P.A.M. Bakkers (TU Delft - QN/Bakkers Lab, Eindhoven University of Technology)
Alexander Brinkman (University of Twente)
Floris A. Zwanenburg (University of Twente)
More Info
expand_more
Abstract
A Ge–Si core–shell nanowire is used to realize a Josephson field-effect transistor with highly transparent contacts to superconducting leads. By changing the electric field, access to two distinct regimes, not combined before in a single device, is gained: in the accumulation mode the device is highly transparent and the supercurrent is carried by multiple subbands, while near depletion, the supercurrent is carried by single-particle levels of a strongly coupled quantum dot operating in the few-hole regime. These results establish Ge–Si nanowires as an important platform for hybrid superconductor–semiconductor physics and Majorana fermions.
No files available
Metadata only record. There are no files for this record.