Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection

Holmqvist, Cecilia; Fogelström, Mikael; Belzig, Wolfgang

Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection

Dateien

Holmqvist_224736.pdfGröße: 716.3 KBDownloads: 162

Datum

2013

Autor:innen

Holmqvist, Cecilia

Fogelström, Mikael

Belzig, Wolfgang

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Preprint

Publikationsstatus

Published

Zusammenfassung

We investigate the charge and spin transport of a voltage-biased superconducting point contact coupled to a nanomagnet. The magnetization of the nanomagnet is assumed to precess with the Larmor frequency, $\omega_L$, due to ferromagnetic resonance. The interplay between the ac Josephson current and the magnetization dynamics leads to spin-polarized Shapiro steps at voltages $|V|=\hbar \omega_L/2en$ for $n=1,2,...$ and the subharmonic steps with $n>1$ are a consequence of multiple Andreev reflection (MAR). Moreover, the spin-precession-assisted MAR generates quasiparticle scattering amplitudes that, due to interference, lead to current-voltage characteristics of the dc charge and spin currents with subharmonic gap structures displaying an even-odd effect.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

HOLMQVIST, Cecilia, Mikael FOGELSTRÖM, Wolfgang BELZIG, 2013. Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection

BibTex

@unpublished{Holmqvist2013Spinp-22473,
  year={2013},
  title={Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection},
  author={Holmqvist, Cecilia and Fogelström, Mikael and Belzig, Wolfgang}
}

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