Abstract
Correlation effects influencing the optical properties of semiconductors that cannot be described at the basis of Hartree-Fock approximation are intensively studied at the present time. Equations of motion methods,1 the Green’s function formalism2 or the cumulant expansion method with fluctuation-dissipation theorem3 are successfully used to explain distinctive features of optical spectra of semiconductors.
© 2002 Optical Society of America
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