Strong Correlations in Electron Doped Phthalocyanine Conductors Near Half Filling

TL;DR

This paper predicts that electron-doped nontransition metal-phthalocyanines near half filling exhibit strong electron correlations, potentially leading to Mott insulating states and unconventional superconductivity due to their orbital degeneracy and Coulomb interactions.

Contribution

It introduces the idea that nontransition metal-phthalocyanines can be strongly correlated metals with novel phases near half filling, expanding the scope of correlated electron systems.

Findings

Prediction of Mott insulators at half filling

Potential for strongly correlated superconductivity

Identification of unconventional phases in molecular conductors

Abstract

We propose that electron doped nontransition metal-phthalocyanines (MPc) like ZnPc and MgPc, similar to those very recently reported, should constitute novel strongly correlated metals. Due to orbital degeneracy, Jahn-Teller coupling and Hund's rule exchange, and with a large on-site Coulomb repulsion, these molecular conductors should display, particularly near half filling at two electrons/molecule, very unconventional properties, including Mott insulators, strongly correlated superconductivity, and other intriguing phases.