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

Autores
Fernández, Lucas Jonatan; Pastawski, Horacio Miguel
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We describe the spin-dependent quantum conductance in a wire where a magnetic eld is spatially modulated. The change in direction and intensity of the magnetic eld acts as aperturbation that mixes spin projections. This is exempli ed by a ferromagnetic nanowire. Therethe local eld varies smoothly its direction generating a domain wall (DW) as described by thewell-known Cabrera-Falicov model. Here, we generalize this model to include also a strength mod-ulation. We identify two striking diabatic regimes that appear when such magnetic inhogeneityoccurs. 1) If the eld strength at the DW is weak enough, the local Zeeman energies result in anavoided crossing. Thus, the spin- ip probability follows the Landau-Zener formula. 2) For strong elds, the spin-dependent conductance shows oscillations as a function of the DW width. Weinterpret them in terms of Rabi oscillations. Time and length scales obtained from this simpli edview show an excellent agreement with the exact dynamical solution of the spin-dependent trans-port. These results remain valid for other situations involving modulated magnetic structures andthus they open new prospects for the use of quantum interferences in spin-based devices.
Fil: Fernández, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina
Fil: Pastawski, Horacio Miguel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina
Materia
Spin polarized transport
Magnetoelectronics
spintronics
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/31829
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/31829
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Landau-Zener and Rabi oscillations in the spin-dependent conductanceFernández, Lucas JonatanPastawski, Horacio MiguelSpin polarized transportMagnetoelectronicsspintronicshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We describe the spin-dependent quantum conductance in a wire where a magnetic eld is spatially modulated. The change in direction and intensity of the magnetic eld acts as aperturbation that mixes spin projections. This is exempli ed by a ferromagnetic nanowire. Therethe local eld varies smoothly its direction generating a domain wall (DW) as described by thewell-known Cabrera-Falicov model. Here, we generalize this model to include also a strength mod-ulation. We identify two striking diabatic regimes that appear when such magnetic inhogeneityoccurs. 1) If the eld strength at the DW is weak enough, the local Zeeman energies result in anavoided crossing. Thus, the spin- ip probability follows the Landau-Zener formula. 2) For strong elds, the spin-dependent conductance shows oscillations as a function of the DW width. Weinterpret them in terms of Rabi oscillations. Time and length scales obtained from this simpli edview show an excellent agreement with the exact dynamical solution of the spin-dependent trans-port. These results remain valid for other situations involving modulated magnetic structures andthus they open new prospects for the use of quantum interferences in spin-based devices.Fil: Fernández, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; ArgentinaFil: Pastawski, Horacio Miguel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; ArgentinaEurophysics Letters2014-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/31829Pastawski, Horacio Miguel; Fernández, Lucas Jonatan; Landau-Zener and Rabi oscillations in the spin-dependent conductance; Europhysics Letters; Europhysics Letters; 105; 1-2014; 17005-170110295-5075CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1209/0295-5075/105/17005/metainfo:eu-repo/semantics/altIdentifier/doi/10.1209/0295-5075/105/17005info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:24:25Zoai:ri.conicet.gov.ar:11336/31829instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:24:26.237CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
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, Lucas Jonatan
Spin polarized transport
Magnetoelectronics
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, Lucas Jonatan
Pastawski, Horacio Miguel
author Fernández, Lucas Jonatan
author_facet Fernández, Lucas Jonatan
Pastawski, Horacio Miguel
author_role author
author2 Pastawski, Horacio Miguel
author2_role author
dc.subject.none.fl_str_mv Spin polarized transport
Magnetoelectronics
spintronics
topic Spin polarized transport
Magnetoelectronics
spintronics
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We describe the spin-dependent quantum conductance in a wire where a magnetic eld is spatially modulated. The change in direction and intensity of the magnetic eld acts as aperturbation that mixes spin projections. This is exempli ed by a ferromagnetic nanowire. Therethe local eld varies smoothly its direction generating a domain wall (DW) as described by thewell-known Cabrera-Falicov model. Here, we generalize this model to include also a strength mod-ulation. We identify two striking diabatic regimes that appear when such magnetic inhogeneityoccurs. 1) If the eld strength at the DW is weak enough, the local Zeeman energies result in anavoided crossing. Thus, the spin- ip probability follows the Landau-Zener formula. 2) For strong elds, the spin-dependent conductance shows oscillations as a function of the DW width. Weinterpret them in terms of Rabi oscillations. Time and length scales obtained from this simpli edview show an excellent agreement with the exact dynamical solution of the spin-dependent trans-port. These results remain valid for other situations involving modulated magnetic structures andthus they open new prospects for the use of quantum interferences in spin-based devices.
Fil: Fernández, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina
Fil: Pastawski, Horacio Miguel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina
description We describe the spin-dependent quantum conductance in a wire where a magnetic eld is spatially modulated. The change in direction and intensity of the magnetic eld acts as aperturbation that mixes spin projections. This is exempli ed by a ferromagnetic nanowire. Therethe local eld varies smoothly its direction generating a domain wall (DW) as described by thewell-known Cabrera-Falicov model. Here, we generalize this model to include also a strength mod-ulation. We identify two striking diabatic regimes that appear when such magnetic inhogeneityoccurs. 1) If the eld strength at the DW is weak enough, the local Zeeman energies result in anavoided crossing. Thus, the spin- ip probability follows the Landau-Zener formula. 2) For strong elds, the spin-dependent conductance shows oscillations as a function of the DW width. Weinterpret them in terms of Rabi oscillations. Time and length scales obtained from this simpli edview show an excellent agreement with the exact dynamical solution of the spin-dependent trans-port. These results remain valid for other situations involving modulated magnetic structures andthus they open new prospects for the use of quantum interferences in spin-based devices.
publishDate 2014
dc.date.none.fl_str_mv 2014-01
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 http://hdl.handle.net/11336/31829
Pastawski, Horacio Miguel; Fernández, Lucas Jonatan; Landau-Zener and Rabi oscillations in the spin-dependent conductance; Europhysics Letters; Europhysics Letters; 105; 1-2014; 17005-17011
0295-5075
CONICET Digital
CONICET
url http://hdl.handle.net/11336/31829
identifier_str_mv Pastawski, Horacio Miguel; Fernández, Lucas Jonatan; Landau-Zener and Rabi oscillations in the spin-dependent conductance; Europhysics Letters; Europhysics Letters; 105; 1-2014; 17005-17011
0295-5075
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1209/0295-5075/105/17005/meta
info:eu-repo/semantics/altIdentifier/doi/10.1209/0295-5075/105/17005
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Europhysics Letters
publisher.none.fl_str_mv Europhysics Letters
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.069144

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