Figure 1

STM images for a coverage dependence of SrTiO ₃ homoepitaxy. The 50 × 50-nm² STM images of (a) 0.6-ML, (b) 0.3-ML, and (c) 0.1-ML SrTiO₃ films grown on (2 × 1) reconstructed 0.1% Nb-doped SrTiO₃ (001) surfaces at T _sub = 580°C. The crystallographic axes are shown by the yellow arrows in (c), and some larger islands are indicated by the dotted yellow circles. All STM images were obtained with V _S = 2.5 V and I _set = 50 pA. (d) The height profile along the yellow line in (a).