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(Color online) (a) Sheet resistance as a function of temperature for GdTiO3/SrTiO3/LSAT structures with varying SrTiO3 thicknesses, indicated by the labels. The GdTiO3 film grown directly on LSAT is labeled “0 nm.” (b) Sheet carrier density and mobility at room temperature and 2.5 K.
(Color online) (a) Room temperature sheet carrier concentrations of SrTiO3/GdTiO3/SrTiO3 multilayers as a function of multilayer repeats (x). The dashed line indicates the expected sheet carrier concentration scaling with number of repeats as calculated from the x = 1 sample. (b) High-angle annular dark-field scanning transmission electron microscopy image of the x = 20 multilayer.
(Color online) Calculated (a) charge distribution and (b) band alignment for a SrTiO3/GdTiO3/SrTiO3 heterostructure. The Fermi level is shown as a dotted line.
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