Institution: | 1. Hitachi Research Laboratory, Hitachi Ltd, 7-1 Omika, Hitachi, Ibaraki, 319-1221, Japan 2. College of Science and Technology, Nihon University, 7-24-1 Narashino-dai, Funabashi, Chiba, 274-8501, Japan 3. ATR Laboratories, 2-2-2 Hikari-dai, Seika-chou, Kyoto, 619-0288, Japan 4. Department of Physics, Kyoto University, Kyoto, 606-8501, Japan 5. Department of Physics, Niigata University, Ikarashi, Niigata, 950-2181, Japan
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