Loss of Pi-Junction Behaviour in an Interacting Impurity Josephson Junction

Details Loss of Pi-Junction Behaviour in an Interacting Impurity Josephson Junction Loss of Pi-Junction Behaviour in an Interacting Impurity Josephson Junction

1999-10-13

arxiv.org/abs/cond-mat/9910201v3

Phys. Rev. B 61, 9109 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures; labelling of Fig. 3 corrected; final published form, only trivial changes

Scientific paper

10.1103/PhysRevB.61.9109

Using a generalization of the non-crossing approximation which incorporates Andreev reflection, we study the properties of an infinite-U Anderson impurity coupled to two superconducting leads. In the regime where $\Delta$ and $T_K$ are comparable, we find that the position of the sub-gap resonance in the impurity spectral function develops a strong anomalous phase dependence-- its energy is a minimum when the phase difference between the superconductors is equal to $\pi$. Calculating the Josephson current through the impurity, we find that $\pi$-junction behaviour is lost as the position of the bound-state moves above the Fermi energy.

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