期刊
PHYSICAL REVIEW B
卷 88, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.195152
关键词
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资金
- European Research Council Advanced Grant DYNamo [ERC-2010-AdG-267374]
- Spanish grants [2010-21282-C02-01, PIB2010US-00652]
- Grupos Consolidados UPV/EHU del Gobierno Vasco [IT578-13]
- European Commission [280879-2 CRONOS CP-FP7]
- GENCI [544]
- European Community-Research Infrastructure Action of the FP7
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.
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