# Effective field theory of interacting π electrons

@article{Barr2012EffectiveFT, title={Effective field theory of interacting $\pi$ electrons}, author={Joshua D. Barr and Justin P Bergfield and Charles A. Stafford}, journal={Physical Review B}, year={2012}, volume={86}, pages={115403} }

We develop a \pi-electron effective field theory (\pi-EFT) wherein the two-body Hamiltonian for a \pi-electron system is expressed in terms of three effective parameters: the \pi-orbital quadrupole moment, the on-site repulsion, and a dielectric constant. As a first application of this \pi-EFT, we develop a model of screening in molecular junctions based on image multipole moments, and use this to investigate the reduction of the HOMO-LUMO gap of benzene. Beyond this, we also use \pi-EFT to…

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