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The electronic structure of the unoccupied and occupied states of potassium(K)-doped and undoped picene crystalline films has been investigated by usingthe element-selective and bulk-sensitive photon-detection methods of X-rayabsorption and emission spectroscopies. We observed the formation of thedoping-induced unoccupied and occupied electronic states in K-doped picene. Byapplying the inner-shell resonant-excitation experiments, we observed theevidence for the orbital hybridization between K and picene near the Fermienergy. Furthermore, the resonant X-ray emission experiment suggests thepresence of the Raman-active vibronic interaction in K-doped picene. Theseexperimental evidences play a crucial role in the superconductivity of K-dopedpicene.

Hybridized electronic states in potassium-doped picene probed by soft x-ray spectroscopies