Absence of metallicity in K-doped picene: Importance of electronic correlations

Andreas Ruff, Michael Sing, Ralph Claessen, Hunpyo Lee, Milan Tomić, Harald O. Jeschke, Roser Valentí

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)


Potassium-doped picene (Kxpicene) has recently been reported to be a superconductor at x=3 with critical temperatures up to 18 K. Here we study the electronic structure of K-doped picene films by photoelectron spectroscopy and ab initio density functional theory combined with dynamical mean-field theory (DFT+DMFT). Experimentally we observe that, except for spurious spectral weight due to the lack of a homogeneous chemical potential at low K concentrations (x≈1), the spectra always display a finite energy gap. This result is supported by our DFT+DMFT calculations which provide clear evidence that Kxpicene is a Mott insulator for integer doping concentrations x=1, 2, and 3. We discuss various scenarios to understand the discrepancies with previous reports of superconductivity and metallic behavior.

Original languageEnglish
Article number216403
JournalPhysical Review Letters
Issue number21
Publication statusPublished - May 21 2013
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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