Josephson Current through a Nanoscale Magnetic Quantum Dot

F. Siano; R. Egger

doi:10.1103/PhysRevLett.93.047002

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Josephson Current through a Nanoscale Magnetic Quantum Dot

F. Siano, R. Egger

DOI 10.1103/PhysRevLett.93.047002 · Physical Review Letters

T1

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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 π junction behavior in a numerically exact way. Within the “magnetic” regime, U/Γ≫1 and ϵ0/Γ≤1, the Josephson current is found to depend only on Δ/TK, where Δ 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 Δ/TK.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown