Critical Current 0−π Transition in Designed Josephson Quantum Dot Junctions

2007/07/18 by H. Ingerslev Jørgensen, H. I. Jørgensen, T. Novotný +7 · 2 citations
Physics and Astronomy · #Mechanical and Optical Resonators #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.supr-con

paper · pdf · doi:10.1021/nl071152w

published as NANO LETTERS 7 (8): 2441-2445 AUG 2007 · 5 pages, 4 figures, (Supplementary information available at http://www.fys.ku.dk/~hij/public/nl_supp.pdf)

openalex publication_date 2007/07/18 · arxiv created 2007/07/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

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.

Citations

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Kondo effect and Josephson current through a quantum dot between two superconductors
• Josephson Current through a Nanoscale Magnetic Quantum Dot
• Tunable Supercurrent Through Semiconductor Nanowires

Cited by

• Tuning the Josephson current in carbon nanotubes with the Kondo effect
• Visualizing supercurrents in ferromagnetic Josephson junctions with various arrangements of 0 andπsegments