Role of Surface States for the Epitaxial Growth on Metal Surfaces
A model is presented which relates the diffusion behaviour on metal surfaces to the charge density supplied by occupied 2-dimensional free electron surface states. Depopulation of these states by confinement on to small islands or by proper adsorbates increases the diffusion barrier on flat terraces and lowers the additional barrier for step down diffusion, thus yielding enhanced interlayer transport. This provides a possible explanation for the phenomena of low temperature reentrant and surfactant mediated layer by layer growth. The model supported by photoemission results.
Bibliographic Reference: Article : Physical Review Letters, Vol. 73 (1995), No. 3, pp. 485-488
Record Number: 199512132 / Last updated on: 1996-01-15
Original language: en
Available languages: en