Affiliation: | RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;Department of Applied Physics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan;CREST, Japan Corporation of Science and Technology, Saitama 332-0012, Japan |