Overhangs in the solid-on-solid model

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Within the framework of a solid-on-solid model we have derived expressions for [110] and [010] step free energies of a simple square (001) surface. We show that at elevated temperatures overhangs in the steps cannot be ignored. With increasing temperature, the free energy curves of [110] and [010] steps nicely collapse onto each other. This means that (1) the two-dimensional equilibrium shape of an ad-atom island or vacancy island will exhibit a perfectly circular shape at elevated temperatures and (2) the step free energies vanishes at the same temperature leading to an isotropic thermal roughening of the (001) surface.
Original languageUndefined
Pages (from-to)142-145
Number of pages4
JournalPhysics letters A
Issue number1-2
Publication statusPublished - 2004


  • METIS-220908
  • IR-73071

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