Influence of oxygen vacancies on two-dimensional electron systems at SrTiO3-based interfaces and surfaces
1 Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, 97074 Würzburg, Germany
2 Institut für Theoretische Physik, Goethe-Universtät Frankfurt, 60438 Frankfurt am Main, Germany
3 I. Institut für Theoretische Physik, Universität Hamburg, 20355 Hamburg, Germany
4 Institut für Keramische Hochleistungswerkstoffe, Technische Universität Hamburg-Harburg, 21073 Hamburg, Germany
a Present Address: Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
b e-mail: email@example.com
Received: 17 February 2017
Revised: 13 March 2017
Published online: 10 July 2017
The insulator SrTiO3 can host high-mobility two-dimensional electron systems on its surfaces and at interfaces with other oxides. While for the bare surface a two-dimensional electron system can only be induced by oxygen vacancies, it is believed that the metallicity of heterostructure interfaces as in LaAlO3/SrTiO3 is caused by other mechanisms related to the polar discontinuity at the interface. Based on calculations using density functional and dynamical mean-field theory as well as on experimental results using photoemission spectroscopy we elucidate the role of oxygen vacancies, thereby highlighting their importance for the electronic and magnetic properties of the systems under study.
© The Author(s) 2017
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