Dispersions of image potential states on surfaces of clean graphite and lead phthalocyanine film |
| |
Authors: | Yamamoto Ryota Yamada Takashi Taguchi Masataka Miyakubo Keisuke Kato Hiroyuki S Munakata Toshiaki |
| |
Affiliation: | Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. |
| |
Abstract: | Dispersions of image potential states on a graphite surface (denoted IPS1) and on 1 monolayer (ML) film (denoted IPS2) of lead phthalocyanine (PbPc) are investigated by the micro-spot angle-resolved two-photon photoemission (micro-AR-2PPE) spectroscopy. On the graphite surface, whole dispersions of the two members of IPS1 (n = 1 and 2) are observed. The n = 1 IPS1 peak is weakly visible at energy higher than the vacuum level. The effective mass of an electron in the n = 1 IPS1 becomes slightly light at the high momentum region, suggesting the interaction between the IPS1 and the unoccupied σ-band of graphite. On the PbPc film, the IPS2 band forms a band gap and back-folds at the boundary of the Brillouin zone. A 1-dimensional Kronig-Penny model is used to reproduce the effective mass and the shift of binding energy. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|