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Josephson current through a quantum dot coupled to a molecular magnet
Universität Konstanz, Germany.
Universität Konstanz, Germany.ORCID iD: 0000-0001-5551-8980
Universität Konstanz, Germany.
2013 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 88, 104512Article in journal (Refereed) Published
Abstract [en]

Josephson currents are carried by sharp Andreev states within the superconducting energy gap. We theoretically study the electronic transport of a magnetically tunable nanoscale junction consisting of a quantum dot connected to two superconducting leads and coupled to the spin of a molecular magnet. The exchange interaction between the molecular magnet and the quantum dot modifies the Andreev states due to a spin-dependent renormalization of the quantum dot's energy level and the induction of spin flips. A magnetic field applied to the central region of the quantum dot and the molecular magnet further tunes the Josephson current and starts a precession of the molecular magnet's spin. We use a nonequilibrium Green's function approach to evaluate the transport properties of the junction. Our calculations reveal that the energy level of the dot, the magnetic field, and the exchange interaction between the molecular magnet and the electrons occupying the energy level of the quantum dot can trigger transitions from a 0 to a π state of the Josephson junction. The redistribution of the occupied states induced by the magnetic field strongly modifies the current-phase relation. The critical current exhibits a sharp increase as a function of either the energy level of the dot, the magnetic field, or the exchange interaction.

Place, publisher, year, edition, pages
2013. Vol. 88, 104512
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:lnu:diva-63803DOI: 10.1103/PhysRevB.88.104512OAI: oai:DiVA.org:lnu-63803DiVA: diva2:1095339
Available from: 2017-05-12 Created: 2017-05-12 Last updated: 2017-05-15Bibliographically approved

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Holmqvist, Cecilia
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Citation style
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