Landau-Zener and Rabi oscillations in the spin-dependent conductance

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We describe the spin-dependent quantum conductance in a wire where a magnetic field is spatially modulated. The changes in direction and intensity of the magnetic field acts as a perturbation that mixes spin projections. This is exemplified by a ferromagnetic nanowire. There the local field...

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Autores principales: Fernández Alcázar, Lucas Jonatan, Pastawski, Horacio Miguel
Formato: article
Lenguaje:Inglés
Publicado: 2021
Materias:
Magnetoresistencia
Rabi oscillations
Landau-Zener
Spintronics
Acceso en línea:http://hdl.handle.net/11086/20425
http://dx.doi.org/10.1209/0295-5075/105/17005
Aporte de:
Repositorio Digital Universitario (UNC) de Universidad Nacional de Córdoba
id I10-R14111086-20425
record_format dspace
institution Universidad Nacional de Córdoba
institution_str I-10
repository_str R-141
collection Repositorio Digital Universitario (UNC)
language Inglés
topic Magnetoresistencia
Rabi oscillations
Landau-Zener
Spintronics
spellingShingle Magnetoresistencia
Rabi oscillations
Landau-Zener
Spintronics
Fernández Alcázar, Lucas Jonatan
Pastawski, Horacio Miguel
Landau-Zener and Rabi oscillations in the spin-dependent conductance
topic_facet Magnetoresistencia
Rabi oscillations
Landau-Zener
Spintronics
description We describe the spin-dependent quantum conductance in a wire where a magnetic field is spatially modulated. The changes in direction and intensity of the magnetic field acts as a perturbation that mixes spin projections. This is exemplified by a ferromagnetic nanowire. There the local field varies smoothly its direction generating a domain wall (DW) as described by the well known Cabrera-Falicov model. Here, we generalize this model to include also a strength modulation. We identify two striking diabatic regimes that appear when such magnetic inhogeneity occurs. 1) If the field strength at the DW is weak enough the local Zeeman energies result in an avoided crossing. Thus, the spin flip probability follows the Landau-Zener formula. 2) For strong fields, the spin-dependent conductance shows oscillations as function of the DW width. We interpret them in terms of Rabi oscillations. Time and length scales obtained from this simplified view show an excellent agreement with the exact dynamical solution of the spin-dependent transport. These results remain valid for other situations involving modulated magnetic structures and thus they open new prospects for the use of quantum interferences in spin-based devices.
format article
author Fernández Alcázar, Lucas Jonatan
Pastawski, Horacio Miguel
author_facet Fernández Alcázar, Lucas Jonatan
Pastawski, Horacio Miguel
author_sort Fernández Alcázar, Lucas Jonatan
title Landau-Zener and Rabi oscillations in the spin-dependent conductance
title_short Landau-Zener and Rabi oscillations in the spin-dependent conductance
title_full Landau-Zener and Rabi oscillations in the spin-dependent conductance
title_fullStr Landau-Zener and Rabi oscillations in the spin-dependent conductance
title_full_unstemmed Landau-Zener and Rabi oscillations in the spin-dependent conductance
title_sort landau-zener and rabi oscillations in the spin-dependent conductance
publishDate 2021
url http://hdl.handle.net/11086/20425
http://dx.doi.org/10.1209/0295-5075/105/17005
work_keys_str_mv AT fernandezalcazarlucasjonatan landauzenerandrabioscillationsinthespindependentconductance
AT pastawskihoraciomiguel landauzenerandrabioscillationsinthespindependentconductance
bdutipo_str Repositorios
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