Abstract
Ultrahigh vacuum atomic force microscopy is employed to measure the adhesive force of atomically flat (111) oriented Pb island on Si (111) surface at low temperature (∼60K). The experimental results indicate that for the same (111) surface the adhesive force changes and oscillates with the island thickness. This phenomenon is shown to originate from the electron structure modulation by strong quantum size effects along the island surface normal direction, which modifies surface energy and leads to the observed oscillatory adhesive forces.
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