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.
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Ulbrich, R.G. (1995). Dynamics of Optical Excitations in Semiconductors. In: Burstein, E., Weisbuch, C. (eds) Confined Electrons and Photons. NATO ASI Series, vol 340. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1963-8_2
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