Momentum dependence of the excitons in pentacene
Friedrich Roth, Roman Schuster, Andreas K\"onig, Martin Knupfer,, Helmuth Berger
TL;DR
This study investigates the momentum-dependent behavior of excitons in pentacene using electron energy-loss spectroscopy, revealing anisotropic dispersion and charge transfer admixture in the exciton wave function.
Contribution
It provides the first detailed measurement of the full exciton band structure in pentacene, highlighting anisotropic dispersion and charge transfer effects.
Findings
Excitons can move coherently within the a*,b* plane.
Exciton dispersion is highly anisotropic.
Charge transfer excitations strongly mix with excitons.
Abstract
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.
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