The Interacting Impurity Josephson Junction: Variational Wavefunctions and Slave Boson Mean Field Theory

Details The Interacting Impurity Josephson Junction: Variational Wavefunctions and Slave Boson Mean Field Theory The Interacting Impurity Josephson Junction: Variational Wavefunctions and Slave Boson Mean Field Theory

2000-01-06

arxiv.org/abs/cond-mat/0001062v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages; 4 encapsulated PostScript figures; submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.62.6687

We investigate the Josephson coupling between two superconductors mediated through an infinite U Anderson impurity, adapting a variational wavefunction approach which has proved successful for the Kondo model. Unlike the Kondo problem, however, a crossing of singlet and doublet state energies may be produced by varying the ratio of Kondo energy to superconducting gap, in agreement with recent work of Clerk and Ambegaokar. We construct the phase diagram for the junction and discuss properties of different phases. In addition, we find the singlet and doublet state energies within a slave boson mean field approach. We find the slave boson mean field treatment is unable to account for the level crossing.

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