Critical current 0-pi transition in designed Josephson Quantum Dot junctions

H Ingerslev Jørgensen; T Novotný; K Grove-Rasmussen; K Flensberg; P E Lindelof

doi:10.1021/nl071152w

Critical current 0-pi transition in designed Josephson Quantum Dot junctions

Nano Lett. 2007 Aug;7(8):2441-5. doi: 10.1021/nl071152w. Epub 2007 Jul 18.

Authors

H Ingerslev Jørgensen¹, T Novotný, K Grove-Rasmussen, K Flensberg, P E Lindelof

Affiliation

¹ Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark. [email protected]

PMID: 17637018
DOI: 10.1021/nl071152w

Abstract

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.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Computer Simulation
Computer-Aided Design
Electric Conductivity
Electron Transport
Microelectrodes
Models, Chemical*
Models, Molecular*
Nanotechnology / instrumentation
Nanotechnology / methods
Quantum Dots*
Semiconductors*