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Using low-energy electron microscopy, we show that de-wetting of Ag and Cu films on Ru(0001) occurs by 3-D islands migrating across step edges in the “downhill” direction. We have observed islands thicken by more than 50 atomic layers in this manner. The island migration allows 3-D growth to occur in a way that avoids the nucleation barrier associated with forming 2-D islands on top of 3-D islands...
The wetting process of the GaN(0001) surface by Ga is studied in situ in real time by low energy electron microscopy and diffraction. The reversibility of the phase transitions in the wetting layer is examined in detail and the consequences for the growth of GaN layers by reaction with ammonia and activated nitrogen are discussed. It is concluded that the growth of smooth (0001)-terminated GaN layers...
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