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Phys. Rev. Lett. 76 (1996) pp. 2298-2301
Quantum wells and electron interference phenomena in Al due to subsurface noble gas bubbles
Institut für Allgemeine Physik, Technische Universität Wien, A-1040 Wien, Austria
School of Physics, University of Bath, BA2 7AY, United Kingdom
Abstract
Scanning tunneling miscroscopy on Ar ion bombarded and annealed aluminum
surfaces shows electron interference between the surface and subsurface
bubbles of implanted gas. The depth of the bubbles as determined from the
energy dependence of the standing waves indicates a minimum around 6-7
layers on Al(111). The appearance and energy dependence of the interference
pattern is in good agreement with scattering theory based on free electrons,
and indicates the bubbles have a shape given by the Wulff construction.