C. Girardeaux, et al.
J. Phys. IV France 132 (2006) 199-203
Metal induced gap states at tetratetracontane/Cu interfaceM. Kiguchi1, G. Yoshikawa2, K. Saiki2, R. Arita3 and H. Aoki3
1 Div. Chemistry, Graduate School of Science, Hokkaido Univ., Sapporo, Hokkaido 060-0810, Japan
2 Dep. Compl. Sci. & Eng., Grad. Sch. Frontier Sci., Univ. Tokyo, Kashiwa, Chiba 277-8561, Japan
3 Dep. Physics, Graduate School of Science, Univ. Tokyo, Hongo, Tokyo 113-0033, Japan
In order to search for states specific to organic-insulator/metal interfaces, we have studied atomically well-defined tetratetracontane(TTC)/Cu interface with the element-selective near edge x-ray absorption fine structure (NEXAFS). An extra peak is observed below the bulk edge onset for thin TTC films on Cu. We regard the pre-peak as an evidence for the metal-induced gap states (MIGS) formed by the proximity to a metal. An ab initio electronic structure calculation supports the existence of the MIGS.
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