Wave control of heat eigenstates by use of high-power terahertz wave
| Project/Area Number |
17K18765
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics and related fields
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
藤井 康裕 立命館大学, 理工学部, 講師 (50432050)
野竹 孝志 国立研究開発法人理化学研究所, 光量子工学研究センター, 研究員 (70413995)
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| Project Period (FY) |
2017-06-30 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 第二音波 / 量子常誘電体 / 高強度テラヘルツ波 / ソフトモード / 熱の波動伝搬 / テラヘルツ波 / ハイパーラマン散乱 / 熱波動 / ソフトモードフォノン / 熱の波動 |
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| Outline of Final Research Achievements |
The objective of the research is to establish a more advantageous situation for the propagation of the second sound in quantum paraelectrics, by exciting the soft phonon mode with a high-power terahertz wave source. In this project, we have developed a portable high-power terahertz souce, established a method of anti-reflection coating on a quantum paraelectric against terahertz radiation, and revealed the physical mechanism of optical generation of coherent heat wave. These achievements are expected to contribute not only to the development of heat-wave science, but also to understanding of the soft mode in ferroelectrics and related materials.
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| Academic Significance and Societal Importance of the Research Achievements |
一般にペロフスカイト型の強誘電体関連物質ではSrTiO3 と同様にソフトモードが存在し，有限のキュリー温度でソフトモードが凍結するものは強誘電体となるが．ソフトモードが明瞭に観測できないものも少なくない．また，キュリー温度が明確に定義できない散漫な相転移を示すリラクサー強誘電体でもソフトモードを観測することは非常に難しいが，本研究におけるテラヘルツ波反射防止処理によるソフトモード励振とハイパーラマン散乱分光は，これらの強誘電体関連物質におけるソフトモード分光の強力なツールともなり得るものと期待される．
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Report
(4 results)
Research Products
(95 results)
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[Journal Article] Molecular Vibration and Boson Peak Analysis of Glucose Polymers and Ester via Terahertz Spectroscopy2020
Author(s)
Junlan Zhong, Tatsuya Mori, Yasuhiro Fujii, Takanari Kashiwagi, Wakana Terao, Midori Yamashiro, Hidotoshi Minami, Manabu Tsujimoto, Teruhiko Tanaka, Hidehisa Kawashima, Junko Ito, Masashi Kijima, Masatoshi Iji, Makoto M. Watanabe, Kazuo Kadowaki
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Journal Title
Carbohydr. Polym.
Volume: 232
Pages: 115789-115789
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] テラヘルツ帯分光による非晶質一酸化シリコンのボゾンピークの研究2020
Author(s)
森龍也, 増渕麻衣子, 藤井康裕, 気谷卓, 小原真司, 平田秋彦, 所裕子, 大越慎一, 是枝聡肇, 川路均, 小島誠治
Organizer
日本物理学会第75回年次大会
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