Josephson current through a nanoscale magnetic quantum dot

Details Josephson current through a nanoscale magnetic quantum dot Josephson current through a nanoscale magnetic quantum dot

2004-05-28

arxiv.org/abs/cond-mat/0405670v1

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

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.93.047002

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, $U/\Gamma\gg 1$ and $\epsilon_0/\Gamma\leq 1$, the Josephson current is found to depend only on $\Delta/T_K$, where $\Delta$ is the BCS gap and $T_K$ 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 $\Delta/T_K$.

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