Abstract
We study the K∕β-SiC(100) c(4×2) surface by atom-resolved scanning tunneling microscopy and spectroscopy, and synchrotron radiation-based photoemission spectroscopy. At intermediate coverages, the K atoms are grouped by pairs around Si dimers at pedestal sites, in a 2×3 long-range ordering leaving 1∕3 of the pedestal sites unoccupied, while keeping the semiconducting c(4×2) surface unchanged as identified by tunneling through the K overlayer. At saturation, additional K atoms adsorb on remaining pedestal sites and act as atomic “contacts” between two K pairs, leading to K atom chain formation in a 2×1 metallic surface.
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