1. Physics,
Department of Natural Sciences and Center for Functional Materials, Åbo Akademi University, Porthansgatan 3, 20500 Turku, Finland
2. Research
Center for Advanced Science and Technology, The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan
3. Laboratory
of Physical Chemistry, Department of Natural Sciences and Center for
Functional Materials, Åbo Akademi University, Porthansgatan 3, 20500 Turku, Finland
4. Electronic
Materials Research Department, Nissan Chemical Industry, Ltd., 488-6,
Suzumi-cho, Funabashi-shi, Chiba 274-0052, Japan