Affiliation: | aNanomaterials Laboratory, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;bICORP, Japan Science and Technology Agency (JST), 4-8-1 Honcho, Kawaguchi, Saitama 332-0012, Japan;cSORST, Japan Science and Technology Agency (JST), 4-8-1 Honcho, Kawaguchi, Saitama 332-0012, Japan;dDepartment of Material and Life Science, Osaka Univ., 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan |