Atomic structure of Bi on the Si(111) surface

摘要: Bi‐induced (√3×√3)R30° structures formed on the Si(111) surface are studied using scanning tunneling microscopy (STM) and low‐energy electron diffraction (LEED). Three distinct phases identified depending Bi coverage: monomer, trimer, honeycomb phases. The √3×√3 symmetry is preserved for these in LEED observation. At low coverages, atoms found to occupy T4 site. In this adsorption geometry, monomer phase (α phase) stably up ideal coverage of 1/3 ML (ML=monolayer). trimer (β at saturation 1 ML, individual clusters clearly resolved. Between two however, a honeycomb‐type reconstruction has also been by STM coexist with phase. This result reveals new dependent process involving surface.