Abstract
A periodic step density wave, which is induced by Au adsorption under step-down current heating, was found on Si(111) vicinal surfaces by reflection electron microscopy. In this step instability extremely straight step bands and (111) terraces are periodically arranged. This step instability is only observed by composition of metal adsorption and dc-heating effects, and the periodic structure vanishes when heating current direction change to the step-up direction. Quantitative analysis of growth of the terrace width during step bunching process shows that the permeability of steps for Si adatoms depends on the heating current direction and steps are permeable for step-up current heating and are impermeable for step-down current heating. The changes of bunching pattern and of the step permeability should be due to change of step structure depending on the heating current direction.
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