Dynamical properties of an isolated step

A. Virlouvet, H. Grimech, A. Khater, Y. Pennec, K. Maschke

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    The dynamics for a model system of an isolated infinite step in a surface are presented. The model is simple, treating the monatomic step as the interface between two coupled semi-infinite and single semi-infinite atomic layers. The breakdown of translational symmetry perpendicular to the step edge gives rise to several Rayleigh-like branches localized in the neighbourhood of the step. It is seen that a step may lift the polarization degeneracy of the ordered surface Rayleigh mode along the atomic rows parallel to and in the neighbourhood of the step edge. Typical dispersion curves for these modes along the step edge are given with their polarizations. The vibrational Green functions are calculated for the system, and the spectral densities are presented numerically for atomic sites that constitute a minimum representative set in the neighbourhood of the step. A hyperfine resonance structure is obtained that permits the analysis of the evolution of the dynamics from one half-space to the other.

    Original languageEnglish
    Pages (from-to)7589-7603
    Number of pages15
    JournalJournal of Physics Condensed Matter
    Issue number41
    Publication statusPublished - 7 Oct 1996


    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics

    Cite this

    Virlouvet, A., Grimech, H., Khater, A., Pennec, Y., & Maschke, K. (1996). Dynamical properties of an isolated step. Journal of Physics Condensed Matter, 8(41), 7589-7603. https://doi.org/10.1088/0953-8984/8/41/008