title: Electronic states of a C70 monolayer on the surface of Ag(111).
abstract: We have investigated the electronic states of a C(70) monolayer on the surface of Ag(111) (1 ML C(70)/Ag(111)) using synchrotron radiation photoelectron spectroscopy and soft x-ray absorption spectroscopy techniques. The experimental data exhibit metallic properties and at least 2.6 e(-) charge transfer per C(70) molecule. The screening effect of Ag(111) on the electronic structure of C(70) is remarkable; it greatly reduces or even eliminates the on-site Hubbard energy. The work functions of the C(70) multilayer and monolayer are determined as 4.53 eV and 4.52 eV respectively. The energy levels of C(70) align with the Fermi level of the Ag(111) substrate, and the shift of the vacuum level caused by C(70) adsorption is negligible. Potassium doping indicates that 1 ML C(70)/Ag(111) can still accommodate about nine electrons and that the sample remains metallic at any doping level.
authors: Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.
authors: Peng
authors: P
authors: Wang
authors: Liang
authors: L
authors: Meng
authors: Xiao-Bo
authors: XB
authors: Wang
authors: Yan-Jun
authors: YJ
authors: Li
authors: Chun-Qi
authors: CQ
authors: Sheng
authors: Jia-Ou
authors: JO
authors: Wang
authors: Hai-Jie
authors: HJ
authors: Qian
authors: Kurash
authors: K
authors: Ibrahim
authors: Hong-Nian
authors: HN
authors: Li