Thermal stability and electronic structure of atomically uniform Pb films on Si(111).
Atomically uniform Pb films are successfully prepared on Si(111), despite a large lattice mismatch. Angle-resolved photoemission measurements of the electronic structure show layer-resolved quantum well states which can be correlated with dramatic variations in thermal stability. The odd film thicknesses N = 5, 7, and 9 monolayers show sharp quantum well states. The even film thicknesses N = 6 and 8 do not, but are much more stable than the odd film thicknesses. This correlation is discussed in terms of a total energy calculation and Friedel-like oscillations in properties.
Frederick Seitz Materials Research Laboratory, Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-2902, USA.
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Upton
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Wei
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Chou
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Miller
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Chiang