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(a) High-resolution -contrast image of the interface (Sample 1). The GaAs is seen in the  projection, the SrTiO  shows the brighter Sr and the less bright column, while the O columns are not visible. A drawing of the atomic column arrangement is shown in the top part. (b) -contrast image of the interface with GaAs in the -projection. The heavier As atoms form a rectangular structure with the Ga columns in the center and the proposed atomic structure of the interface is superimposed to the top part experimental image. The effects of sample drift during the acquisition can be seen as the apparent “bending” of the atomic planes.
Atomic-resolution micrograph of the Sample 2 heterointerface . The interface model is seen in the top part of the image; multislice -contrast image simulations of this structure are superimposed on the experimental image in the bottom part. (b) Ball-and-stick model of the interfacial atomic arrangement for .
Comparison of XPS spectra of the positions from: (a) The bare GaAs (001), (b) the , (c) the interface in Sample 1, and (d) Sample 2.
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