1208.2101 (Hiroyuki Yamane et al.)

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

Hiroyuki Yamane, Nobuhiro Kosugi

The electronic structure of the unoccupied and occupied states of potassium (K)-doped picene has been investigated by using the element-selective and bulk-sensitive photon-detection methods of X-ray absorption and emission spectroscopies. We observed the formation of the doping-induced unoccupied and occupied electronic states in K-doped picene. By applying the inner-shell resonant-excitation experiments, we clearly observed the evidence for the orbital hybridization between K and picene near the Fermi energy, which plays a crucial role in the superconductivity of K-doped picene. Furthermore, the resonant X-ray emission experiment also suggests the presence of the Raman-active vibronic interaction in K-doped picene. These observations are the direct experimental prediction for the elucidation of the superconductivity in aromatic hydrocarbon molecules.

View original: http://arxiv.org/abs/1208.2101