Influence of oxygen vacancies on two-dimensional electron systems at SrTiO3-based interfaces and surfaces

Michael Sing, Harald O. Jeschke, Frank Lechermann, Roser Valentí & Ralph Claessen
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...
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