Electronic structure of solid coronene: differences and commonalities to picene

Details Electronic structure of solid coronene: differences and commonalities to picene Electronic structure of solid coronene: differences and commonalities to picene

2011-05-02

arxiv.org/abs/1105.0248v2

Phys. Rev. B 84, 020507(R) (2011)

Physics

Condensed Matter

Superconductivity

5 pages, to be published in Phys. Rev. B

Scientific paper

We have obtained the first-principles electronic structure of solid coronene, which has been recently discovered to exhibit superconductivity with potassium doping. Since coronene, along with picene, the first aromatic superconductor, now provide a class of superconductors as solids of aromatic compounds, here we compare the two cases in examining the electronic structures. In the undoped coronene crystal, where the molecules are arranged in a herringbone structure with two molecules in a unit cell, the conduction band above an insulating gap is found to comprise four bands, which basically originate from the lowest two unoccupied molecular orbitals (doubly-degenerate, reflecting the high symmetry of the molecular shape) in an isolated molecule but the bands are entangled as in solid picene. The Fermi surface for a candidate of the structure of K$_x$coronene with $x=3$, for which superconductivity is found, comprises multiple sheets, as in doped picene but exhibiting a larger anisotropy with different topology.

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