A Laser‐ARPES view of the 2D electron systems at LaAlO_3 /SrTiO_3 and Al/SrTiO_3 interfaces

The electronic structure of the two-dimensional electron system (2DES) found at the Al/SrTiO_3 (Al/STO) and LaAlO_3/SrTiO_3 (LAO/STO) interfaces is measured by means of laser angle resolved photoemission spectroscopy, taking advantage of the large photoelectron escape depth at low photon energy to p...

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Authors: McKeown Walker, Siobhan, Boselli, Margherita, Martínez, Emanuel Alberto, Gariglio, Stefano, Bruno, Flavio Yair, Baumberger, Felix
Format: article
Publication Date:2022
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/71534
Online Access:https://hdl.handle.net/20.500.14352/71534
Access Level:Open access
Keyword:538.9
2DEG
Al/SrTiO_3
ARPES
Electronic structure
LaAlO_3/SrTiO_3
SrTiO_3
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
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oai_identifier_str oai:docta.ucm.es:20.500.14352/71534
network_acronym_str ES
network_name_str España
repository_id_str
spelling A Laser‐ARPES view of the 2D electron systems at LaAlO_3 /SrTiO_3 and Al/SrTiO_3 interfacesMcKeown Walker, SiobhanBoselli, MargheritaMartínez, Emanuel AlbertoGariglio, StefanoBruno, Flavio YairBaumberger, Felix538.92DEGAl/SrTiO_3ARPESElectronic structureLaAlO_3/SrTiO_3SrTiO_3Física de materialesFísica del estado sólido2211 Física del Estado SólidoThe electronic structure of the two-dimensional electron system (2DES) found at the Al/SrTiO_3 (Al/STO) and LaAlO_3/SrTiO_3 (LAO/STO) interfaces is measured by means of laser angle resolved photoemission spectroscopy, taking advantage of the large photoelectron escape depth at low photon energy to probe these buried interfaces. The possibility of tuning the electronic density in Al/STO by varying the Al layer thickness is demonstrated, and it is shown that the electronic structure evolution is well described by self-consistent tight binding supercell calculations, but differs qualitatively from a rigid band shift model. It is shown that both 2DES are strongly coupled to longitudinal optical phonons, in agreement with previous reports of a polaronic ground state in similar STO based 2DESs. Tuning the electronic density in Al/STO to match that of LAO/STO and comparing both systems, it is estimated that the intrinsic LAO/STO 2DES has a bare band width of approximate to 60 meV and a carrier density of approximate to 6 x 10^13 cm^-2.WileyUniversidad Complutense de Madrid20222022-03-1620222022-03-16journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/71534reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial 3.0 Españahttps://creativecommons.org/licenses/by-nc/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/715342026-06-02T12:44:21Z
dc.title.none.fl_str_mv A Laser‐ARPES view of the 2D electron systems at LaAlO_3 /SrTiO_3 and Al/SrTiO_3 interfaces
title A Laser‐ARPES view of the 2D electron systems at LaAlO_3 /SrTiO_3 and Al/SrTiO_3 interfaces
spellingShingle A Laser‐ARPES view of the 2D electron systems at LaAlO_3 /SrTiO_3 and Al/SrTiO_3 interfaces
McKeown Walker, Siobhan
538.9
2DEG
Al/SrTiO_3
ARPES
Electronic structure
LaAlO_3/SrTiO_3
SrTiO_3
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
title_short A Laser‐ARPES view of the 2D electron systems at LaAlO_3 /SrTiO_3 and Al/SrTiO_3 interfaces
title_full A Laser‐ARPES view of the 2D electron systems at LaAlO_3 /SrTiO_3 and Al/SrTiO_3 interfaces
title_fullStr A Laser‐ARPES view of the 2D electron systems at LaAlO_3 /SrTiO_3 and Al/SrTiO_3 interfaces
title_full_unstemmed A Laser‐ARPES view of the 2D electron systems at LaAlO_3 /SrTiO_3 and Al/SrTiO_3 interfaces
title_sort A Laser‐ARPES view of the 2D electron systems at LaAlO_3 /SrTiO_3 and Al/SrTiO_3 interfaces
dc.creator.none.fl_str_mv McKeown Walker, Siobhan
Boselli, Margherita
Martínez, Emanuel Alberto
Gariglio, Stefano
Bruno, Flavio Yair
Baumberger, Felix
author McKeown Walker, Siobhan
author_facet McKeown Walker, Siobhan
Boselli, Margherita
Martínez, Emanuel Alberto
Gariglio, Stefano
Bruno, Flavio Yair
Baumberger, Felix
author_role author
author2 Boselli, Margherita
Martínez, Emanuel Alberto
Gariglio, Stefano
Bruno, Flavio Yair
Baumberger, Felix
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 538.9
2DEG
Al/SrTiO_3
ARPES
Electronic structure
LaAlO_3/SrTiO_3
SrTiO_3
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
topic 538.9
2DEG
Al/SrTiO_3
ARPES
Electronic structure
LaAlO_3/SrTiO_3
SrTiO_3
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
description The electronic structure of the two-dimensional electron system (2DES) found at the Al/SrTiO_3 (Al/STO) and LaAlO_3/SrTiO_3 (LAO/STO) interfaces is measured by means of laser angle resolved photoemission spectroscopy, taking advantage of the large photoelectron escape depth at low photon energy to probe these buried interfaces. The possibility of tuning the electronic density in Al/STO by varying the Al layer thickness is demonstrated, and it is shown that the electronic structure evolution is well described by self-consistent tight binding supercell calculations, but differs qualitatively from a rigid band shift model. It is shown that both 2DES are strongly coupled to longitudinal optical phonons, in agreement with previous reports of a polaronic ground state in similar STO based 2DESs. Tuning the electronic density in Al/STO to match that of LAO/STO and comparing both systems, it is estimated that the intrinsic LAO/STO 2DES has a bare band width of approximate to 60 meV and a carrier density of approximate to 6 x 10^13 cm^-2.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022-03-16
2022
2022-03-16
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/20.500.14352/71534
url https://hdl.handle.net/20.500.14352/71534
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
Atribución-NoComercial 3.0 España
https://creativecommons.org/licenses/by-nc/3.0/es/
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
Atribución-NoComercial 3.0 España
https://creativecommons.org/licenses/by-nc/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
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_ 1869423369413197824
score 15.198674

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