We use photoemission spectroscopy to study electronic structures of pristine and K-doped solid picene. The valence band spectrum of pristine picene consists of three main features with no state at the Fermi level (EF), while that of K-doped picene has three structures similar to those of pristine picene with new states near EF, consistent with the semiconductor-metal transition. The K-induced change cannot be explained with a simple rigid-band model of pristine picene, but can be interpreted by molecular orbital calculations considering electron-intramolecular-vibration interaction. Excellent agreement of the K-doped spectrum with the calculations points to importance of electron-intramolecular-vibration interaction in K-doped picene.
@article{arxiv.1011.2030,
title = {Electronic structure of pristine and K-doped solid picene: Non-rigid-band change and its implication for electron-intramolecular-vibration interaction},
author = {H. Okazaki and T. Wakita and T. Muro and Y. Kaji and X. Lee and H. Mitamura and N. Kawasaki and Y. Kubozono and Y. Yamanari and T. Kambe and T. Kato and M. Hirai and Y. Muraoka and T. Yokoya},
journal= {arXiv preprint arXiv:1011.2030},
year = {2010}
}