Charge Transfer, Phase Separation, and Mott-Hubbard Transition in Potassium-Doped Coronene Films
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AbstractScanning tunneling microscopy and spectroscopy have been applied to study the pristine and potassium-doped coronene films at the molecular level with the doping ratio x ranging from 0 to 4. Both the morphology and the electronic property were found to be strongly governed by the amount of charge transfer. Certain phases of K(3)Coronene and K(4)Coronene could be fabricated at the corresponding K doping ratios. While in K(4)Coronene a doubly degenerate LUMO state of the undoped coronene became fully occupied, in K(3)Coronene that state was observed to cross the Fermi level and split into an upper unoccupied part and a lower occupied part, implying the presence of electronic correlation effect and Mott-Hubbard transition in the system. The observed four different phases of K(3)Coronene further showed different strengths of electronic correlation effect and led us to speculate that the superconductivity transition with different T-c in potassium-doped observed elsewhere might have an origin from the electronic correlation effect with different strengths.
All Author(s) ListWu XF, Xu CQ, Wang KD, Xiao XD
Journal nameJournal of Physical Chemistry C
Volume Number120
Issue Number28
Pages15446 - 15452
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesChemistry; Chemistry, Physical; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Science & Technology - Other Topics

Last updated on 2021-16-09 at 01:00