Josephson Current through a Nanoscale Magnetic Quantum Dot

2004/05/28 by F. Siano, R. Egger, Reinhold Egger · 4 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.93.047002

published as Phys. Rev. Lett. 93, 047002 (2004)

arxiv created 2004/05/28 · openalex publication_date 2004/07/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We present theoretical results for the equilibrium Josephson current through an Anderson dot tuned into the magnetic regime, using Hirsch-Fye Monte Carlo simulations covering the complete crossover from Kondo-dominated physics to pi junction behavior in a numerically exact way. Within the "magnetic" regime, U/Gamma >> 1 and epsilon0/Gamma < or = 1, the Josephson current is found to depend only on Delta/TK, where Delta is the BCS gap and TK the Kondo temperature. The junction behavior can be classified into four different quantum phases. We describe these behaviors, specify the associated three transition points, and identify a local minimum in the critical current of the junction as a function of Delta/TK.

Citations

• Kondo effect and Josephson current through a quantum dot between two superconductors
• Scaling Theory of the Asymmetric Anderson Model

Cited by

• Critical Current 0−π Transition in Designed Josephson Quantum Dot Junctions
• Kondo effect in asymmetric Josephson couplings through a quantum dot
• Iterative real-time path integral approach to nonequilibrium quantum transport
• Tuning the Josephson current in carbon nanotubes with the Kondo effect