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Institute
for Solid State Physics,
University of TokyoGraduate
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Hidefumi
Akiyama Laboratory,
Ph. D. student
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5-1-5
Kashiwanoha, Kashiwa, Chiba,
Japan
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Tel：+81-4-7136-3387
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| Fax :+81-4-7136-3388 |
| E-mail : taka8484@issp.u-tokyo.ac.jp |
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