Tkachov, Grigory and Richter, Klaus (2007) Effect of magnetic pair breaking on Andreev bound states and resonant supercurrent in quantum dot Josephson junctions. PHYSICAL REVIEW B, 75 (13): 134517. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
We propose a model for resonant Josephson tunneling through quantum dots that accounts for Cooper pair-breaking processes in the superconducting leads caused by a magnetic field or spin-flip scattering. The pair-breaking effect on the critical supercurrent I-c and the Josephson current-phase relation I(phi) is largely due to the modification of the spectrum of Andreev bound states below the reduced (Abrikosov-Gorkov) quasiparticle gap. For a quantum dot formed in a quasi-one-dimensional channel, both I-c and I(phi) can show a significant magnetic-field dependence induced by pair breaking despite the suppression of the orbital magnetic-field effect in the channel. This case is relevant to recent experiments on quantum dot Josephson junctions in carbon nanotubes. Pair-breaking processes are taken into account via the relation between the Andreev scattering matrix and the quasiclassical Green functions of the superconductors in the Usadel limit.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SUPERCONDUCTING ALLOYS; IMPURITIES; EQUATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 21 Dec 2020 08:16 |
| Last Modified: | 21 Dec 2020 08:16 |
| URI: | https://pred.uni-regensburg.de/id/eprint/33000 |
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