Bound states and Josephson current in mesoscopic {ital s}-wave superconductor{endash}normal-metal{endash}{ital d}-wave superconductor junctions
- Department of Physics, University of Hong Kong, Pokfulam Road (Hong Kong)
We have investigated the superconducting phase difference dependence of Andreev levels and Josephson current through a mesoscopic normal-metal layer in contact with two superconducting electrodes with {ital s}-wave and {ital d}-wave pairing symmetry ({ital S}{sub {ital sNS}}{sub {ital d}} junction). It is shown that, regardless of the junction length, due to the sign change of the {ital d}-wave order parameter under suitable arrangements, the zero-energy point of Andreev levels for the negative process appears at {var_phi}=0. In particular, at zero temperature, the amplitude of the total Josephson current through the point contact {ital S}{sub {ital sNS}}{sub {ital d}} junction could be enhanced by the sign change of the {ital d}-wave order parameter. However, for an {ital S}{sub {ital sNS}}{sub {ital d}} junction of special length, the amplitude of Josephson current may be suppressed by this sign change. Moreover, as a special case, the midgap surface states discovered by Hu [Phys. Rev. Lett. {bold 72}, 1526 (1994)] are recovered naturally. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 383181
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 54, Issue 10; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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