Two-dimensional electron gas with universal subbands at the surface of SrTiO3

A. F. Santander-Syro (), O. Copie, T. Kondo, F. Fortuna, S. Pailhès, R. Weht, X. G. Qiu, F. Bertran, A. Nicolaou, A. Taleb-Ibrahimi, P. Le Fèvre, G. Herranz, M. Bibes, N. Reyren, Y. Apertet, P. Lecoeur, A. Barthélémy and M. J. Rozenberg
Additional contact information
A. F. Santander-Syro: CSNSM, CNRS/IN2P3 and Université Paris-Sud, Bâtiments 104 et 108, 91405 Orsay cedex, France
O. Copie: Unité Mixte de Physique CNRS/Thales, 1 Avenue A. Fresnel, Campus de l’Ecole Polytechnique, 91767 Palaiseau, France
T. Kondo: Iowa State University
F. Fortuna: CSNSM, CNRS/IN2P3 and Université Paris-Sud, Bâtiments 104 et 108, 91405 Orsay cedex, France
S. Pailhès: Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette, France
R. Weht: Gerencia de Investigación y Aplicaciones, Comisión Nacional de Energía Atómica, Avenida General Paz y Constituyentes, 1650 San Martín, Argentina
X. G. Qiu: Institute of Physics and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Zhongguancun nansanjie 8, Beijing 100190, China
F. Bertran: Synchrotron SOLEIL, CNRS-CEA, L’Orme des Merisiers, Saint-Aubin-BP48, 91192 Gif-sur-Yvette, France
A. Nicolaou: Synchrotron SOLEIL, CNRS-CEA, L’Orme des Merisiers, Saint-Aubin-BP48, 91192 Gif-sur-Yvette, France
A. Taleb-Ibrahimi: Synchrotron SOLEIL, CNRS-CEA, L’Orme des Merisiers, Saint-Aubin-BP48, 91192 Gif-sur-Yvette, France
P. Le Fèvre: Synchrotron SOLEIL, CNRS-CEA, L’Orme des Merisiers, Saint-Aubin-BP48, 91192 Gif-sur-Yvette, France
G. Herranz: Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus de la UAB, 08193 Bellaterra, Catalonia, Spain
M. Bibes: Unité Mixte de Physique CNRS/Thales, 1 Avenue A. Fresnel, Campus de l’Ecole Polytechnique, 91767 Palaiseau, France
N. Reyren: Unité Mixte de Physique CNRS/Thales, 1 Avenue A. Fresnel, Campus de l’Ecole Polytechnique, 91767 Palaiseau, France
Y. Apertet: Institut d’Electronique Fondamentale, Université Paris-Sud, Bâtiment 220, 91405 Orsay, France
P. Lecoeur: Institut d’Electronique Fondamentale, Université Paris-Sud, Bâtiment 220, 91405 Orsay, France
A. Barthélémy: Unité Mixte de Physique CNRS/Thales, 1 Avenue A. Fresnel, Campus de l’Ecole Polytechnique, 91767 Palaiseau, France
M. J. Rozenberg: Laboratoire de Physique des Solides, Université Paris-Sud, Bâtiment 510, 91405 Orsay, France

Nature, 2011, vol. 469, issue 7329, 189-193

Abstract: Oxide electronics advance At surfaces or interfaces of materials, electronic states can form that have novel properties that are different from the bulk. Tailoring such properties in thin film oxide devices has led to a new field of research — known as oxide electronics — in which the material strontium titanate (SrTiO3) takes a central role. In particular, an exotic two-dimensional electron gas (2DEG) forms at oxide interfaces based on SrTiO3, but the precise nature of the 2DEG has remained elusive. Santander-Syro et al. carry out a systematic study using angle-resolved photoemission spectroscopy (ARPES), and obtain new insights into the electronic bandstructure of the 2DEG. Their findings shed light on previous observations in SrTiO3-based heterostructures and suggest that different forms of electron confinement at the surface of SrTiO3 lead to essentially the same 2DEG.

Date: 2011
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DOI: 10.1038/nature09720

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