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Santander-Syro, A.F.; Copie, O.; Kondo, T.; Fortuna, F.; Pailhés, S.; Weht, R.; Qiu, X.G.; Bertran, F.; Nicolaou, A.; Taleb-Ibrahimi, A.; Le F́vre, P.; Herranz, G.; Bibes, M.; Reyren, N.; Apertet, Y.; Lecoeur, P.; Barthélémy, A.; Rozenberg, M.J. "Two-dimensional electron gas with universal subbands at the surface of SrTiO 3" (2011) Nature. 469(7329):189-194
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Abstract:

As silicon is the basis of conventional electronics, so strontium titanate (SrTiO3) is the foundation of the emerging field of oxide electronics1,2. SrTiO3 is the preferred template for the creation of exotic, two-dimensional (2D) phases of electron matter at oxide interfaces3-5 that have metalg-insulator transitions6,7, superconductivity8,9 or large negative magnetoresistance 10. However, the physical nature of the electronic structure underlying these 2D electron gases (2DEGs), which is crucial to understanding their remarkable properties11,12, remains elusive. Here we show, using angle-resolved photoemission spectroscopy, that there is a highly metallic universal 2DEG at the vacuum-cleaved surface of SrTiO3 (including the non-doped insulating material) independently of bulk carrier densities over more than seven decades. This 2DEG is confined within a region of about five unit cells and has a sheet carrier density of ∼0.33 electrons per square lattice parameter. The electronic structure consists of multiple subbands of heavy and light electrons. The similarity of this 2DEG to those reported in SrTiO3-based heterostructures and field-effect transistors suggests that different forms of electron confinement at the surface of SrTiO3 lead to essentially the same 2DEG. Our discovery provides a model system for the study of the electronic structure of 2DEGs in SrTiO3-based devices and a novel means of generating 2DEGs at the surfaces of transition-metal oxides. © 2011 Macmillan Publishers Limited. All rights reserved.

Registro:

Documento: Artículo
Título:Two-dimensional electron gas with universal subbands at the surface of SrTiO 3
Autor:Santander-Syro, A.F.; Copie, O.; Kondo, T.; Fortuna, F.; Pailhés, S.; Weht, R.; Qiu, X.G.; Bertran, F.; Nicolaou, A.; Taleb-Ibrahimi, A.; Le F́vre, P.; Herranz, G.; Bibes, M.; Reyren, N.; Apertet, Y.; Lecoeur, P.; Barthélémy, A.; Rozenberg, M.J.
Filiación:CSNSM, CNRS/IN2P3, Université Paris-Sud, Bâtiments 104 et 108, 91405 Orsay cedex, France
Laboratoire Physique et Etude des Matériaux, UMR 8213 ESPCI-CNRS-UPMC, 10 rue Vauquelin, 75231 Paris cedex 5, France
Unité Mixte de Physique CNRS/Thales, Campus de l'Ecole Polytechnique, 1 Avenue A. Fresnel, 91767 Palaiseau, France
Université Paris-Sud, 91405 Orsay, France
Universität Würzburg, Experimentelle Physik VII, 97074 Würzburg, Germany
Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States
Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette, France
Gerencia de Investigación y Aplicaciones, Comisión Nacional de Energía Atómica, Avenida General Paz y Constituyentes, 1650 San Martín, Argentina
Instituto Sábato, Universidad Nacional de San Martín - CNEA, 1650 San Martín, Argentina
Institute of Physics, National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Zhongguancun nansanjie 8, Beijing 100190, China
Synchrotron SOLEIL, CNRS-CEA, l'Orme des Merisiers, Saint-Aubin-BP48, 91192 Gif-sur-Yvette, France
Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus de la UAB, 08193 Bellaterra, Catalonia, Spain
Institut d'Electronique Fondamentale, Université Paris-Sud, Bâtiment 220, 91405 Orsay, France
Laboratoire de Physique des Solides, Université Paris-Sud, Bâtiment 510, 91405 Orsay, France
Departamento de Física, FCEN-UBA, Ciudad Universitaria, Pabellón 1, Buenos Aires (1428), Argentina
Palabras clave:metal oxide; strontium; titanium dioxide; electron; gas; insulation; numerical model; oxide; silicon; spectroscopy; two-dimensional modeling; article; conductance; electron; electronics; energy; gas; priority journal; spectroscopy; superconductor
Año:2011
Volumen:469
Número:7329
Página de inicio:189
Página de fin:194
DOI: http://dx.doi.org/10.1038/nature09720
Título revista:Nature
Título revista abreviado:Nature
ISSN:00280836
CODEN:NATUA
CAS:strontium, 7440-24-6; titanium dioxide, 1317-70-0, 1317-80-2, 13463-67-7, 51745-87-0
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00280836_v469_n7329_p189_SantanderSyro

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Citas:

---------- APA ----------
Santander-Syro, A.F., Copie, O., Kondo, T., Fortuna, F., Pailhés, S., Weht, R., Qiu, X.G.,..., Rozenberg, M.J. (2011) . Two-dimensional electron gas with universal subbands at the surface of SrTiO 3. Nature, 469(7329), 189-194.
http://dx.doi.org/10.1038/nature09720
---------- CHICAGO ----------
Santander-Syro, A.F., Copie, O., Kondo, T., Fortuna, F., Pailhés, S., Weht, R., et al. "Two-dimensional electron gas with universal subbands at the surface of SrTiO 3" . Nature 469, no. 7329 (2011) : 189-194.
http://dx.doi.org/10.1038/nature09720
---------- MLA ----------
Santander-Syro, A.F., Copie, O., Kondo, T., Fortuna, F., Pailhés, S., Weht, R., et al. "Two-dimensional electron gas with universal subbands at the surface of SrTiO 3" . Nature, vol. 469, no. 7329, 2011, pp. 189-194.
http://dx.doi.org/10.1038/nature09720
---------- VANCOUVER ----------
Santander-Syro, A.F., Copie, O., Kondo, T., Fortuna, F., Pailhés, S., Weht, R., et al. Two-dimensional electron gas with universal subbands at the surface of SrTiO 3. Nature. 2011;469(7329):189-194.
http://dx.doi.org/10.1038/nature09720