Nucleation and initial growth in the semimetallic homoepitaxial system of Bi on Bi(111),
The nucleation and initial growth of the semimetallic homoepitaxial system of Bi(111) was studied at 130 K by scanning tunneling microscopy. The island density increases with the cubic root of coverage, i.e., nx∝Θ1/3, up to 5.5×1011 islands/cm2 at 0.23 bilayer (BL) coverage. We determined a surface diffusion coefficient of D=2.6×106 s−1. Additionally, a transition of the island shape from compact to quasifractal was observed at about 0.1 BL coverage. The transition island size was estimated to be 70 nm2.
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