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Localized Vibrational Modes in Crystals

  • M. Balkanski
Conference paper
Part of the The IBM Research Symposia Series book series (IRSS)

Abstract

The presence of imperfections in a crystal lattice create electronic or vibrational localized states which destroy the translational symmetry and give rise to a certain number of observable effects. Two reasons generally make possible the spectroscopic observations of these effects: (a) The lattice defects destroy the overall symmetry and relax the perfect crystal selection rules, thus rendering observable optical transitions which would otherwise be forbidden, for example, on normal modes at critical points of the Brillouin zone; and (b) The newly created localized state is characterized by a spectrum of electronic and vibrational levels which can be excited by interaction with the radiation field.

Keywords

Force Constant Localize Mode Resonance Mode Resonant Mode Perfect Lattice 
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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Copyright information

© Plenum Press, New York 1972

Authors and Affiliations

  • M. Balkanski
    • 1
  1. 1.Laboratoire de Physique des Solides associe au C.N.R.S.Universite Paris VIParisFrance

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