Year: 2001
Type: article
Abstract: We study chiral interface Andreev bound states and their influence on the Josephson current between clean superconductors. Possible examples are superconducting ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ and the B phase of the heavy-fermion superconductor ${\mathrm{UPt}}_{3}.$ 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 does not acquire this logarithmic enhancement, although the contribution from the bound states is important in this case as well.
Authors: Yu. S. Barash, A. M. Bobkov, M. Fogelström
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2046515253