Abstract
Calculations based on (occupation constrained) density functional theory using local as well as hybrid functionals to describe the electron-electron exchange and correlation are combined with many-body perturbation theory in order to determine the electronic and optical excitation properties of 5-(pentafluorophenyl)pyrimidin-2-amine, 5-(4-methoxy-2,3,5,6-tetrafluorophenyl)pyrimidin-2-amine, and 5-(4-(dimethylamino)-2,3,5,6-tetrafluorophenyl)pyrimidin-2-amine. Large quasiparticle shifts and exciton binding energies of about 4 eV are found. They cancel each other partially and thus allow for a meaningful description of the molecular optical response within the independent-particle approximation. We find a surprisingly strong influence of local-field effects as well as resonant-nonresonant coupling terms in the electron-hole Hamiltonian on the optical properties.
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Acknowledgements
We gratefully acknowledge financial support from the DFG as well as supercomputer time provided by the HLRS Stuttgart and the Paderborn PC2.
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Riefer, A. et al. (2013). Electronic and Optical Excitations of Aminopyrimidine Molecules from Many-Body Perturbation Theory. In: Nagel, W., Kröner, D., Resch, M. (eds) High Performance Computing in Science and Engineering ‘12. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-33374-3_3
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DOI: https://doi.org/10.1007/978-3-642-33374-3_3
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