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Renormalization of the optical response of semiconductors by electron-phonon interaction

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Cardona,  M.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Cardona, M. (2001). Renormalization of the optical response of semiconductors by electron-phonon interaction. physica status solidi (a), 188(4), 1209-1232.


Cite as: https://hdl.handle.net/21.11116/0000-000E-EFE3-5
Abstract
In the past five years enormous progress has been made in the
ab initio calculations of the optical response of electrons in
semiconductors. The calculations include the Coulomb
interaction between the excited electron and the hole left
behind, as well as local field effects. However, they are
performed under the assumption that the atoms occupy fixed
equilibrium positions and do not include effects of the
interaction of the lattice vibrations with the electronic
states (electron-phonon interaction). This interaction shifts
and broadens the energies at which structure in the optical
spectra is observed, the corresponding shifts being of the
order of the accuracy claimed for the ab initio calculations.
These shifts and broadenings can be calculated with various
degrees of reliability using a number of semiempirical and ab
initio techniques, but no full calculations of the optical
spectra including electron-phonon interaction are available to
date. This article discusses experimental and theoretical
aspects of the renormalization of optical response functions by
electron-phonon interaction, including both temperature and
isotopic mass effects. Some of the theoretical techniques used
can also be applied to analyze the renormalization of other
response functions, such as the phonon spectral functions, the
lattice parameters, and the elastic constants.