Critical charge and spin Josephson currents through a precessing spin

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We present a theoretical study of two superconductors coupled over a spin. The spin is treated classically and is assumed to precess with the Larmor frequency due to an external magnetic field. The precession results in spin-dependent Andreev scattering and a non-equilibrium population of the Andreev levels. Charge and spin currents at zero temperature were studied previously [1]. Here, we focus on the critical current as well as the corresponding spin currents at finite temperatures. At finite temperatures, the spin precession can enhance the supercurrent by a population redistribution. The enhancement leads to a modified current-phase relation and a non-monotonous critical current as function of temperature. This non-monotonous behavior is accompanied by a corresponding change in spin-transfer torques acting on the precessing spin and leads to the possibility of using temperature as a means to tune the back-action on the spin.

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ISO 690HOLMQVIST, Cecilia, Wolfgang BELZIG, Mikael FOGELSTRÖM, 2012. Critical charge and spin Josephson currents through a precessing spin. In: Journal of Physics: Conference Series. Institute of Physics Publishing (IOP). 2012, 400(2), 022027. ISSN 1742-6588. eISSN 1742-6596. Available under: doi: 10.1088/1742-6596/400/2/022027
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@article{Holmqvist2012-12-17Criti-49255,
  year={2012},
  doi={10.1088/1742-6596/400/2/022027},
  title={Critical charge and spin Josephson currents through a precessing spin},
  number={2},
  volume={400},
  issn={1742-6588},
  journal={Journal of Physics: Conference Series},
  author={Holmqvist, Cecilia and Belzig, Wolfgang and Fogelström, Mikael},
  note={Article Number: 022027}
}
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