Multiorbital structure of the two-dimensional electron gas in LaAlO_(3)/SrTiO_(3) heterostructures: the formation of a d(xy) ferromagnetic sheet

We demonstrate the formation of a ferromagnetic two-dimensional d_(x)y electron sheet strictly confined to the TiO_(2) interface layer in LaAlO_(3)/SrTiO_(3) heterostructures. Based on first-principles density functional calculations we show that the complex subband structure of the two-dimensional...

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Detalles Bibliográficos
Autores: Li, Jichao C., Beltrán Fínez, Juan Ignacio, Muñoz, M. Carmen
Tipo de recurso: artículo
Fecha de publicación:2013
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/34782
Acceso en línea:https://hdl.handle.net/20.500.14352/34782
Access Level:acceso abierto
Palabra clave:537
Interface
Superconductivity
Coexistence
Oxides.
Electricidad
Electrónica (Física)
2202.03 Electricidad
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oai_identifier_str oai:docta.ucm.es:20.500.14352/34782
network_acronym_str ES
network_name_str España
repository_id_str
spelling Multiorbital structure of the two-dimensional electron gas in LaAlO_(3)/SrTiO_(3) heterostructures: the formation of a d(xy) ferromagnetic sheetLi, Jichao C.Beltrán Fínez, Juan IgnacioMuñoz, M. Carmen537InterfaceSuperconductivityCoexistenceOxides.ElectricidadElectrónica (Física)2202.03 ElectricidadWe demonstrate the formation of a ferromagnetic two-dimensional d_(x)y electron sheet strictly confined to the TiO_(2) interface layer in LaAlO_(3)/SrTiO_(3) heterostructures. Based on first-principles density functional calculations we show that the complex subband structure of the two-dimensional electron gas (2DEG) generated at the LaO/TiO_(2) (001) interface is universal, and almost independent of the SrTiO_(3) thickness. It is composed of a ladder of d_(x)y states of light electrons and only one degenerate d_(xz,yz) heavier subband. All the states are spin polarized although the exchange splitting is only significant for the lowest energy d_(xy) subband, which leads to magnetic moments ferromagnetically coupled and localized at the interface. The SrTiO_(3) ferroelectric-like lattice distortions determine the subband occupation and therefore their orbital character, exchange splitting, and charge density profile. The complex structure of the 2DEG can explain the coexistence in the same sample of superconductivity and magnetism.American Physical SocietyUniversidad Complutense de Madrid20132013-02-0720132013-02-07journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/34782reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/347822026-06-02T12:44:21Z
dc.title.none.fl_str_mv Multiorbital structure of the two-dimensional electron gas in LaAlO_(3)/SrTiO_(3) heterostructures: the formation of a d(xy) ferromagnetic sheet
title Multiorbital structure of the two-dimensional electron gas in LaAlO_(3)/SrTiO_(3) heterostructures: the formation of a d(xy) ferromagnetic sheet
spellingShingle Multiorbital structure of the two-dimensional electron gas in LaAlO_(3)/SrTiO_(3) heterostructures: the formation of a d(xy) ferromagnetic sheet
Li, Jichao C.
537
Interface
Superconductivity
Coexistence
Oxides.
Electricidad
Electrónica (Física)
2202.03 Electricidad
title_short Multiorbital structure of the two-dimensional electron gas in LaAlO_(3)/SrTiO_(3) heterostructures: the formation of a d(xy) ferromagnetic sheet
title_full Multiorbital structure of the two-dimensional electron gas in LaAlO_(3)/SrTiO_(3) heterostructures: the formation of a d(xy) ferromagnetic sheet
title_fullStr Multiorbital structure of the two-dimensional electron gas in LaAlO_(3)/SrTiO_(3) heterostructures: the formation of a d(xy) ferromagnetic sheet
title_full_unstemmed Multiorbital structure of the two-dimensional electron gas in LaAlO_(3)/SrTiO_(3) heterostructures: the formation of a d(xy) ferromagnetic sheet
title_sort Multiorbital structure of the two-dimensional electron gas in LaAlO_(3)/SrTiO_(3) heterostructures: the formation of a d(xy) ferromagnetic sheet
dc.creator.none.fl_str_mv Li, Jichao C.
Beltrán Fínez, Juan Ignacio
Muñoz, M. Carmen
author Li, Jichao C.
author_facet Li, Jichao C.
Beltrán Fínez, Juan Ignacio
Muñoz, M. Carmen
author_role author
author2 Beltrán Fínez, Juan Ignacio
Muñoz, M. Carmen
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 537
Interface
Superconductivity
Coexistence
Oxides.
Electricidad
Electrónica (Física)
2202.03 Electricidad
topic 537
Interface
Superconductivity
Coexistence
Oxides.
Electricidad
Electrónica (Física)
2202.03 Electricidad
description We demonstrate the formation of a ferromagnetic two-dimensional d_(x)y electron sheet strictly confined to the TiO_(2) interface layer in LaAlO_(3)/SrTiO_(3) heterostructures. Based on first-principles density functional calculations we show that the complex subband structure of the two-dimensional electron gas (2DEG) generated at the LaO/TiO_(2) (001) interface is universal, and almost independent of the SrTiO_(3) thickness. It is composed of a ladder of d_(x)y states of light electrons and only one degenerate d_(xz,yz) heavier subband. All the states are spin polarized although the exchange splitting is only significant for the lowest energy d_(xy) subband, which leads to magnetic moments ferromagnetically coupled and localized at the interface. The SrTiO_(3) ferroelectric-like lattice distortions determine the subband occupation and therefore their orbital character, exchange splitting, and charge density profile. The complex structure of the 2DEG can explain the coexistence in the same sample of superconductivity and magnetism.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-02-07
2013
2013-02-07
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/34782
url https://hdl.handle.net/20.500.14352/34782
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869421865749970944
score 15.301603

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