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Nonequilibrium effects in a Josephson junction coupled to a precessing spin
Chalmers University of Technology.ORCID iD: 0000-0001-5551-8980
Université Pierre et Marie Curie, France.
Chalmers University of Technology.
2011 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 83, 104521Article in journal (Refereed) Published
Abstract [en]

We present a theoretical study of a Josephson junction consisting of two s-wave superconducting leads coupled over a classical spin. When an external magnetic field is applied, the classical spin will precess with the Larmor frequency. This magnetically active interface results in a time-dependent boundary condition with different tunneling amplitudes for spin-up and spin-down quasiparticles and where the precession produces spin-flip scattering processes. We show that as a result, the Andreev states develop sidebands and a nonequilibrium population which depend on the precession frequency and the angle between the classical spin and the external magnetic field. The Andreev states lead to a steady-state Josephson current whose current-phase relation could be used for characterizing the precessing spin. In addition to the charge transport, a magnetization current is also generated. This spin current is time dependent and its polarization axis rotates with the same precession frequency as the classical spin.

Place, publisher, year, edition, pages
2011. Vol. 83, 104521
National Category
Condensed Matter Physics
Research subject
Physics, Condensed Matter Physics
Identifiers
URN: urn:nbn:se:lnu:diva-63808DOI: 10.1103/PhysRevB.83.104521OAI: oai:DiVA.org:lnu-63808DiVA: diva2:1095366
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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