Dynamic response and electronic structure of potassium doped picene investigated by electron energy-loss spectroscopy

Abstract

We performed electron energy-loss spectroscopy studies in order to get a deeper insight into the electronic properties of potassium intercalated picene, a recently discovered superconductor. A comparison of the loss function of the undoped and doped compound shows the appearance of a new peak in the optical gap, which we attribute to the charge carrier plasmon. We find a dramatic increase for the value of the background dielectric constant ${\epsilon }_{\infty }$ upon doping. Our core level excitation data clearly signal filling of the conduction bands with electrons upon potassium addition.

13 pages, 5 figures

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• Ab initio derivation of electronic low-energy models for C60 and aromatic compounds
• Electron Energy-Loss Spectroscopy: A versatile tool for the investigations of plasmonic excitations
• Vibrational spectrum and electron-phonon coupling of doped solid picene from first principles
• Absence of photoemission from the Fermi level in potassium intercalated picene and coronene films: structure, polaron or correlation physics?
• Ab initio electronic and geometrical structures of tripotassium-intercalated phenanthrene
• Electronic structure of undoped and potassium doped coronene investigated by electron energy-loss spectroscopy
• Downfolding electron-phonon Hamiltonians from ab-initio calculations: application to K${}_3$Picene
• Exciton properties of selected aromatic hydrocarbon systems
• Critical Reinvestigation on Vibronic Couplings in Picene from View of Vibronic Coupling Density Analysis
• Hybridized electronic states in potassium-doped picene probed by soft x-ray spectroscopies
• Electronic excitation spectrum of doped organic thin films investigated using electron energy-loss spectroscopy