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

Autores
Fernández Alcázar, Lucas Jonatan; Pastawski, Horacio Miguel
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Fil: Fernández Alcázar, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.
Fil: Fernández Alcázar, Lucas Jonatan. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.
Fil: Pastawski, Horacio Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.
Fil: Pastawski, Horacio Miguel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.
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.
http://iopscience.iop.org/0295-5075/105/1/17005
publishedVersion
Fil: Fernández Alcázar, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.
Fil: Fernández Alcázar, Lucas Jonatan. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.
Fil: Pastawski, Horacio Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.
Fil: Pastawski, Horacio Miguel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.
Física de los Materiales Condensados
Fuente
issn: 1286-4854
Materia
Magnetoresistencia
Rabi oscillations
Landau-Zener
Spintronics
Nivel de accesibilidad
acceso abierto
Condiciones de uso
Repositorio
Repositorio Digital Universitario (UNC)
Institución
Universidad Nacional de Córdoba
OAI Identificador
oai:rdu.unc.edu.ar:11086/20425
Acceder
id RDUUNC_d27b767cbaf800b759504045b35b4232
oai_identifier_str oai:rdu.unc.edu.ar:11086/20425
network_acronym_str RDUUNC
repository_id_str 2572
network_name_str Repositorio Digital Universitario (UNC)
spelling Landau-Zener and Rabi oscillations in the spin-dependent conductanceFernández Alcázar, Lucas JonatanPastawski, Horacio MiguelMagnetoresistenciaRabi oscillationsLandau-ZenerSpintronicsFil: Fernández Alcázar, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.Fil: Fernández Alcázar, Lucas Jonatan. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.Fil: Pastawski, Horacio Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.Fil: Pastawski, Horacio Miguel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.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.http://iopscience.iop.org/0295-5075/105/1/17005publishedVersionFil: Fernández Alcázar, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.Fil: Fernández Alcázar, Lucas Jonatan. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.Fil: Pastawski, Horacio Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.Fil: Pastawski, Horacio Miguel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.Física de los Materiales Condensados2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfFernández-Alcázar, LJ and HM Pastawski. (2014). Landau-Zener and Rabi oscillations in the spin-dependent conductance. EPL (Europhysics Letters) 105 (1), 17005. https://iopscience.iop.org/article/10.1209/0295-5075/105/17005http://hdl.handle.net/11086/20425http://dx.doi.org/10.1209/0295-5075/105/17005issn: 1286-4854reponame:Repositorio Digital Universitario (UNC)instname:Universidad Nacional de Córdobainstacron:UNCenginfo:eu-repo/semantics/openAccess2025-09-29T13:44:36Zoai:rdu.unc.edu.ar:11086/20425Institucionalhttps://rdu.unc.edu.ar/Universidad públicaNo correspondehttp://rdu.unc.edu.ar/oai/snrdoca.unc@gmail.comArgentinaNo correspondeNo correspondeNo correspondeopendoar:25722025-09-29 13:44:36.859Repositorio Digital Universitario (UNC) - Universidad Nacional de Córdobafalse
dc.title.none.fl_str_mv Landau-Zener and Rabi oscillations in the spin-dependent conductance
title Landau-Zener and Rabi oscillations in the spin-dependent conductance
spellingShingle Landau-Zener and Rabi oscillations in the spin-dependent conductance
Fernández Alcázar, Lucas Jonatan
Magnetoresistencia
Rabi oscillations
Landau-Zener
Spintronics
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
dc.creator.none.fl_str_mv Fernández Alcázar, Lucas Jonatan
Pastawski, Horacio Miguel
author Fernández Alcázar, Lucas Jonatan
author_facet Fernández Alcázar, Lucas Jonatan
Pastawski, Horacio Miguel
author_role author
author2 Pastawski, Horacio Miguel
author2_role author
dc.subject.none.fl_str_mv Magnetoresistencia
Rabi oscillations
Landau-Zener
Spintronics
topic Magnetoresistencia
Rabi oscillations
Landau-Zener
Spintronics
dc.description.none.fl_txt_mv Fil: Fernández Alcázar, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.
Fil: Fernández Alcázar, Lucas Jonatan. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.
Fil: Pastawski, Horacio Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.
Fil: Pastawski, Horacio Miguel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.
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.
http://iopscience.iop.org/0295-5075/105/1/17005
publishedVersion
Fil: Fernández Alcázar, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.
Fil: Fernández Alcázar, Lucas Jonatan. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.
Fil: Pastawski, Horacio Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.
Fil: Pastawski, Horacio Miguel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.
Física de los Materiales Condensados
description Fil: Fernández Alcázar, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv Fernández-Alcázar, LJ and HM Pastawski. (2014). Landau-Zener and Rabi oscillations in the spin-dependent conductance. EPL (Europhysics Letters) 105 (1), 17005. https://iopscience.iop.org/article/10.1209/0295-5075/105/17005
http://hdl.handle.net/11086/20425
http://dx.doi.org/10.1209/0295-5075/105/17005
identifier_str_mv Fernández-Alcázar, LJ and HM Pastawski. (2014). Landau-Zener and Rabi oscillations in the spin-dependent conductance. EPL (Europhysics Letters) 105 (1), 17005. https://iopscience.iop.org/article/10.1209/0295-5075/105/17005
url http://hdl.handle.net/11086/20425
http://dx.doi.org/10.1209/0295-5075/105/17005
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv issn: 1286-4854
reponame:Repositorio Digital Universitario (UNC)
instname:Universidad Nacional de Córdoba
instacron:UNC
reponame_str Repositorio Digital Universitario (UNC)
collection Repositorio Digital Universitario (UNC)
instname_str Universidad Nacional de Córdoba
instacron_str UNC
institution UNC
repository.name.fl_str_mv Repositorio Digital Universitario (UNC) - Universidad Nacional de Córdoba
repository.mail.fl_str_mv oca.unc@gmail.com
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score 13.069144

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