Affiliation: | 1. RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;2. Research Institute for Solid State Physics and Optics, H-1525 Budapest, P.O.B. 49, Hungary;3. Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8851, Japan;4. CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan |