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

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 it...

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Detalles Bibliográficos
Autores: Fernández, Lucas Jonatan, Pastawski, Horacio Miguel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/31829
Acceso en línea:http://hdl.handle.net/11336/31829
Access Level:acceso abierto
Palabra clave:Spin polarized transport
Magnetoelectronics
spintronics
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
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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 Técnicas2024-05-08T14:11:55Zoai: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:34982024-05-08 14:11:56.163CONICET 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
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
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
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
topic Spin polarized transport
Magnetoelectronics
spintronics
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
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
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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 15,811543

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