Critical current 0-pi transition in designed Josephson Quantum Dot junctions.
We report on quantum dot based Josephson junctions designed specifically for measuring the supercurrent. From high-accuracy fitting of the current-voltage characteristics, we determine the full magnitude of the supercurrent (critical current). Strong gate modulation of the critical current is observed through several consecutive Coulomb blockade oscillations. The critical current crosses zero close to, but not at, resonance due to the so-called 0-pi transition in agreement with a simple theoretical model.
Jørgensen
H Ingerslev
HI
Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark. hij@fys.ku.dk
Novotný
T
T
Grove-Rasmussen
K
K
Flensberg
K
K
Lindelof
P E
PE
D003198:Computer Simulation; D017076:Computer-Aided Design; D004553:Electric Conductivity; D004579:Electron Transport; D008839:Microelectrodes; D008956:Models, Chemical; D008958:Models, Molecular; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods; D045663:Quantum Dots; D012666:Semiconductors