Session A41: Superconductivity: Multilayers and Josephson Effects
8:00 AM–10:48 AM, Monday, March 15, 2010
Room: F152
Sponsoring Unit:
DCMP
Chair: John Clarke, University of California, Berkeley
Abstract ID: BAPS.2010.MAR.A41.9
Abstract: A41.00009 : Non-equilibrium effects in a Josephson junction coupled to a precessing spin
9:36 AM–9:48 AM
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Abstract 
Authors:
Cecilia Holmqvist
(Chalmers University of Technology)
Sofian Teber
(LPTHE, Universites Paris 6 et 7, CNRS)
Manuel Houzet
(CEA, Grenoble)
Denis Feinberg
(CNRS and UJF, Grenoble)
Mikael Fogelstrom
(Chalmers University of Technology)
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 non-equilibrium 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.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.A41.9