Josephson current between chiral superconductors

Details Josephson current between chiral superconductors Josephson current between chiral superconductors

2001-07-03

arxiv.org/abs/cond-mat/0107059v2

Phys. Rev. B 64, 214503 (2001)

Physics

Condensed Matter

Superconductivity

17 pages, 6 figures

Scientific paper

10.1103/PhysRevB.64.214503

We study chiral interface Andreev bound states and their influence on the Josephson current between clean superconductors. Possible examples are superconducting Sr2RuO4 and the B-phase of the heavy-fermion superconductor UPt3. We show that, under certain conditions, the low-energy chiral surface states enhance the critical current of symmetric tunnel junctions at low temperatures. The enhancement is substantially more pronounced in quantum point contacts. In classical junctions dispersive chiral states result in a logarithmic dependence of the critical current. This logarithmic behavior contains the temperature, the barrier transparency and the broadening of the bound states, and depends on the detailed relation between these parameters. The Josephson current through the domain wall doesn't acquire this logarithmic enhancement, although the contribution from the bound states is important in this case as well.

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