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Minghong TSAI
Institute of Applied Physics, University of Tsukuba, 1–1–1, Tennodai, Tsukuba, Ibaraki, 305–8573 Japan
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Hongxin HUANG
Institute of Applied Physics, University of Tsukuba, 1–1–1, Tennodai, Tsukuba, Ibaraki, 305–8573 Japan
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Masahide ITOH
Institute of Applied Physics, University of Tsukuba, 1–1–1, Tennodai, Tsukuba, Ibaraki, 305–8573 Japan
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Toyohiko YATAGAI
Institute of Applied Physics, University of Tsukuba, 1–1–1, Tennodai, Tsukuba, Ibaraki, 305–8573 Japan