Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Organic semiconductors I (joint session HL/CPP)

CPP 9.4: Talk

Monday, March 16, 2020, 10:15–10:30, POT 112

Exciton dispersion in rubrene single crystals — •Tobias Lettmann and Michael Rohlfing — Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, 48149 Münster

Rubrene single crystals are proposed as components of various organic (opto-)electronic devices. Their electronic (quasiparticle) bandstructure shows an anisotropic behaviour with a relatively strong dispersion of several 100 meV along the Γ-Y direction, whereas the bands are almost flat along the Γ-X direction [1].

Corresponding to the electronic bands, excitons can also exhibit dispersion of their excitation energies as a function of their total momentum (related to their centre-of-mass motion). This dispersion and its anisotropy might be relevant for excitonic hopping transport. In this talk we use the GW/BSE approach of many-body perturbation theory (MBPT) to calculate the excitonic bandstructure of rubrene single crystals in order to investigate if the anisotropy is still present or mitigated by excitonic effects.

[1] S. Yanagisawa et al., Phys. Rev. B 88, 115438 (2013)