Precision measurement of quantum degenerate bulk excitons by excitonic Lyman spectroscopy
| Project/Area Number |
25707024
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Condensed matter physics I
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Yoshioka Kosuke 東京大学, 工学(系)研究科(研究院), 准教授 (70451804)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥25,870,000 (Direct Cost: ¥19,900,000、Indirect Cost: ¥5,970,000)
Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2014: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
Fiscal Year 2013: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
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| Keywords | 励起子 / ボース・アインシュタイン凝縮 / 吸収イメージング / 周波数コム / 光物性 / 高密度励起現象 / レーザー分光 |
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| Outline of Final Research Achievements |
We have succeeded to demonstrate the absorption imaging for trapped 1s paraexcitons in cuprous oxide at 7 K using the excitonic Lyman specrsocopy. This is the first observation of the absorption image in exciton systems in general. that probes 1s paraexcitons via the 1s-2p transition. We have developed a theory that describes the frequency shift of the excitonic internal transitions in a strain-induced trap, and we have compared the numerical results with our experiment. We also extended this experimental method in the mid-infrared to our dilution refrigerator, where we have successfully observed the absorption image of a quantum degenerate exciton gas at around 100 mK. In addition, we have developed two mode-locked femtosecond lasers and controlled them to be ultrafine optical frequency combs. This is the first step towards fine spectroscopy of solids using femtosecond frequency combs.
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Report
(4 results)
Research Products
(24 results)
