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Abstract

The theory of interband transitions given in Chapter 3 neglects the interaction between an electron which has made a transition to the conduction band and the hole which it leaves in the valence band. It is clear that there will be an electrostatic interaction between the electron and hole, screened by other electrons and ions. When this interaction is included in the theory it is found that excited states occur with energies inside the forbidden energy gap of band theory. Transitions to these states can therefore cause absorption at energies below the minimum energy for interband transitions. The excited states are associated with bound electron-hole pairs, called excitons, which can propagate through the crystal.

Keywords

Interband Transition Optical Conductivity Spatial Dispersion Exciton State Exciton Energy 
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. D. L. Dexter and R. S. Knox, ‘Excitons’ ( Interscience, New York, 1965 ).Google Scholar
  2. S. Nikitine, Exciton spectra in semiconductors and ionic compounds, Progress in Semiconductors, 8, 233–322 (1962).Google Scholar

Copyright information

© J. N. Hodgson 1970

Authors and Affiliations

  • J. N. Hodgson
    • 1
  1. 1.University of KeeleUK

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