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arXiv · 1506.07973

Correlated electron behavior of metalorganic molecules: insights from density functional theory combined with many-body effects using exact diagonalization

Sumanta Bhandary·Malte Schüler·Patrik Thunström·Igor di Marco·Barbara Brena·Olle Eriksson·Tim Wehling·Biplab Sanyal
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Abstract

A proper theoretical description of electronic structure of the 3d orbitals in the metal centers of functional metalorganics is a challenging problem. In this letter, we apply density functional theory and an exact diagonalization method in a many body approach to study the ground state electronic configuration of an iron porphyrin (FeP) molecule. Our study reveals that dynamical correlation effects are important, and FeP is a potential candidate for realizing a spin crossover due to a subtle balance of crystal field effects, on-site Coulomb repulsion and hybridization between the Fe d-orbitals and ligand N p-states. The mechanism of switching between two close lying electronic configurations of Fe-d orbitals is shown. We discuss the generality of the suggested approach and the possibility to properly describe the electronic structure and related low energy physics of the whole class of correlated metal centered organometallic molecules.

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Sumanta Bhandary, Malte Schüler, Patrik Thunström, Igor di Marco, Barbara Brena, Olle Eriksson, Tim Wehling, Biplab Sanyal. 2015-06-26. Correlated electron behavior of metalorganic molecules: insights from density functional theory combined with many-body effects using exact diagonalization. https://doi.org/10.1103/physrevb.93.155158

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