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Frenkel versus charge-transfer exciton dispersion in molecular crystals
Abstract : By solving the many-body Bethe-Salpeter equation at finite momentum transfer, we characterize the exciton dispersion in two prototypical molecular crystals, picene and pentacene, in which localized Frenkel excitons compete with delocalized charge-transfer excitons. We explain the exciton dispersion on the basis of the interplay between electron and hole hopping and electron-hole exchange interaction, unraveling a simple microscopic description to distinguish Frenkel and charge-transfer excitons. This analysis is general and can be applied to other systems in which the electron wave functions are strongly localized, as in strongly correlated insulators.
https://hal-polytechnique.archives-ouvertes.fr/hal-00931192
Contributor : Gaëlle Bruant <>
Submitted on : Wednesday, January 15, 2014 - 9:47:19 AM
Last modification on : Friday, March 5, 2021 - 3:10:49 PM
Contributor : Gaëlle Bruant <>
Submitted on : Wednesday, January 15, 2014 - 9:47:19 AM
Last modification on : Friday, March 5, 2021 - 3:10:49 PM
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