Momentum dependence of the excitons in pentacene

Momentum dependence of the excitons in pentacene

We have carried out electron energy-loss investigations of the lowest singlet excitons in pentacene at 20 K. Our studies allow to determine the full exciton band structure in the a* , b* reciprocal lattice plane. The lowest singlet exciton can move coherently within this plane, and the resulting exc...

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Veröffentlicht in:The Journal of chemical physics 2012-05, Vol.136 (20), p.204708-204708-6
Hauptverfasser: Roth, Friedrich, Schuster, Roman, König, Andreas, Knupfer, Martin, Berger, Helmuth
Format: Artikel
Sprache:eng
Schlagworte:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ENERGY LOSSES
EXCITONS
NUCLEAR PHYSICS AND RADIATION PHYSICS
ORGANIC SEMICONDUCTORS
PENTACENE
WAVE FUNCTIONS
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Zusammenfassung:We have carried out electron energy-loss investigations of the lowest singlet excitons in pentacene at 20 K. Our studies allow to determine the full exciton band structure in the a* , b* reciprocal lattice plane. The lowest singlet exciton can move coherently within this plane, and the resulting exciton dispersion is highly anisotropic. The analysis of the energetically following (satellite) features indicates a strong admixture of charge transfer excitations to the exciton wave function.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4723812