physica status solidi (b)
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Editor: Stefan Hildebrandt (Editor-in-Chief), Sabine Bahrs (Deputy Editor)
Online ISSN: 1521-3951
Back Cover: Approaching an organic semimetal: Electron pockets at the Fermi level for a p-benzoquinonemonoimine zwitterion (Phys. Status Solidi B 8/2012)
Most organic materials are insulators or semiconductors and few explicitly exhibit a density of states at the Fermi level. Stable charge-neutral organic molecules do not usually behave as metals because the interatomic hybridization causes the conduction and valence bands to be completely unfilled and filled, respectively. This is to say that for most stable completely organic systems, the chemical potential resides well within the band gap between. There are exceptions, notably the tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) system. Yet a single-component organic conductor remains a Holy Grail of organic chemistry.
Now there is compelling evidence of electron pockets, at the Fermi level, in the band structure for an organic zwitterion molecule of the p-benzoquinonemonoimine type, as outlined by Luis G. Rosa et al. in their article on pp. 1571–1576.