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Surface Phonons

  • Hans Lüth

Abstract

Classical bulk solid-state physics can, broadly speaking, be divided into two parts, one that relates mainly to the electronic properties and another in which the dynamics of the atoms as a whole or of the cores (nuclei and tightly bound core electrons) is treated. This distinction between lattice dynamics and electronic properties, which is followed by nearly every textbook on solid-state physics, is based on the vastly different masses of electrons and atomic nuclei. Displacements of atoms in a solid occur much more slowly than the movements of the electrons. When atoms are displaced from their equilibrium position, a new electron distribution with higher total energy results; but the electron system remains in its ground state, such that after the initial atomic geometry has been reestablished, the whole energy amount is transferred back to the lattice of the nuclei or cores. The electron system is not left in an excited state. The total electronic energy can therefore be considered as a potential for the movement of the nuclei. On the other hand, since the electronic movement is much faster than that of the nuclei, a first approximation for the dynamics of the electrons is based on the assumption of a static lattice with fixed nuclear positions determining the potential for the electrons. This approximation of separate, non-interacting electron dynamics and lattice (nuclear/core) dynamics is called the adiabatic approximation. It was introduced into solid-state and molecular physics by Born and Oppenheimer [5.1]. It is clear, however, that certain phenomena, such as the scattering of conduction electrons on lattice vibrations, are beyond this approximation.

Keywords

Rayleigh Wave Dielectric Function Bulk Mode Vibrational Amplitude Rayleigh Surface Wave 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. X.1
    J.P. Toennies: Phonon interactions in atom scattering from surfaces, in Dynamics of Gas-Surface Interactions, ed. by G. Benedek, U. Valbusa, Springer Ser. Chem. Phys. Vol. 21 ( Springer, Berlin, Heidelberg 1982 ) p. 208CrossRefGoogle Scholar
  2. E. Hulpke (ed.): Helium Atom Scattering from Surfaces, Springer Ser. Surf. Sci., Vol. 27 ( Springer, Berlin, Heidelberg 1992 )Google Scholar
  3. X.2
    S. Yamamoto, R.E. Stickney: J. Chem. Phys. 53, 1594 (1970)CrossRefGoogle Scholar
  4. X.3
    J.P. Toennies: Physica Scripta T1, 89 (1982)CrossRefGoogle Scholar
  5. X.4
    B. Poelsema, G. Comsa: Scattering of Thermal Energy Atoms from Disordered Surfaces, Springer Tracts Mod. Phys., Vol. 115 ( Springer, Berlin, Heidelberg 1989 )CrossRefGoogle Scholar
  6. X.5
    K. Kern, R. David, R.L. Palmer, G. Comsa: Phys. Rev. Lett. 56, 2064 (1986)CrossRefGoogle Scholar
  7. X.6
    P. Zeppenfeld, K. Kern, R. David, K. Kuhnke, G. Comsa: Phys. Rev. B 38, 12329 (1988)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1993

Authors and Affiliations

  • Hans Lüth
    • 1
    • 2
  1. 1.Institut für Schicht- und IonentechnikForschungszentrum Jülich GmbHJülichGermany
  2. 2.Rheinisch-Westfälische Technische HochschuleAachenGermany

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