Evidence for the formation of a Mott state in potassium-intercalated pentacene

Abstract

We investigate electronic transport through pentacene thin-films intercalated with potassium. From temperature-dependent conductivity measurements we find that potassium-intercalated pentacene shows metallic behavior in a broad range of potassium concentrations. Surprisingly, the conductivity exhibits a re-entrance into an insulating state when the potassium concentration is increased past one atom per molecule. We analyze our observations theoretically by means of electronic structure calculations, and we conclude that the phenomenon originates from a Mott metal-insulator transition, driven by electron-electron interactions.

8 pages, 6 figures

References in corpus (4)

• Electronic transport through electron-doped Metal-Phthalocyanine Materials
• Electronic Correlations in Oligo-acene and -thiophene Organic Molecular Crystals
• Electronic structure and correlations in pristine and potassium doped Cu-Phthalocyanine molecular crystals
• Current saturation and Coulomb interactions in organic single-crystal transistors

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• Density functional calculations of the electronic structure and magnetic properties of the hydrocarbon K3picene superconductor near the metal-insulator transition
• Dynamic response and electronic structure of potassium doped picene investigated by electron energy-loss spectroscopy
• Evidence for phase formation in potassium intercalated 1,2;8,9-dibenzopentacene
• Theory of ab initio downfolding with arbitrary range electron-phonon coupling