Dynamics of Optical Excitations in Semiconductors

  • Rainer G. Ulbrich
Part of the NATO ASI Series book series (NSSB, volume 340)

Abstract

A quantum ħω of optical excitation will drive a solid out of thermal equilibrium provided that ħω≫ kT. Here T is the temperature of the solid, and kT characterizes the mean energy of its thermally excited degrees of freedom. The condition is usually met, even far above room temperature, for optical interband transitions in semiconductors. During and after the absorption process a number of electronic and vibronic excited states will be populated and interact with each other. These excitations will subsequently relax towards equilibrium, through exchange of momentum and energy with the rest of the system. In this chapter we shall discuss the elementary steps in this sequence, and the role of optical spectroscopy as a powerful tool for their experimental study.

Keywords

Recombination Helium Shrinkage Coherence GaAs 

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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Rainer G. Ulbrich
    • 1
  1. 1.IV. Physikalisches InstitutGeorg-August-Universität GöttingenGöttingenGermany

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