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  • Title: Mapping the spatial distribution of charge carriers in LaAlO3/SrTiO3 heterostructures.
    Author: Basletic M, Maurice JL, Carrétéro C, Herranz G, Copie O, Bibes M, Jacquet E, Bouzehouane K, Fusil S, Barthélémy A.
    Journal: Nat Mater; 2008 Aug; 7(8):621-5. PubMed ID: 18587402.
    Abstract:
    At the interface between complex insulating oxides, novel phases with interesting properties may occur, such as the metallic state reported in the LaAlO(3)/SrTiO(3) system . Although this state has been predicted and reported to be confined at the interface, some studies indicate a much broader spatial extension, thereby questioning its origin. Here, we provide for the first time a direct determination of the carrier density profile of this system through resistance profile mappings collected in cross-section LaAlO(3)/SrTiO(3) samples with a conducting-tip atomic force microscope (CT-AFM). We find that, depending on specific growth protocols, the spatial extension of the high-mobility electron gas can be varied from hundreds of micrometres into SrTiO(3) to a few nanometres next to the LaAlO(3)/SrTiO(3) interface. Our results emphasize the potential of CT-AFM as a novel tool to characterize complex oxide interfaces and provide us with a definitive and conclusive way to reconcile the body of experimental data in this system.
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