Affiliation: | (1) Laser Science Research Group, The Institute of Physical and Chemical Research (RIKEN), Wako, 351-01 Saitama, Japan;(2) State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Metallurgy, Chinese Academy of Science, 200050 Shanghai, People's Republic of China;(3) Present address: State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Metallurgy, Chinese Academy of Science, 200050 Shanghai, People's Republic of China |