2017 Fiscal Year Final Research Report
Dynamical control of electronic states using extremely strong terahertz light
Project/Area Number |
26247052
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Research Category |
Grant-in-Aid for Scientific Research (A)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Condensed matter physics I
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Research Institution | Kyoto University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
廣理 英基 京都大学, 物質-細胞統合システム拠点, 特定准教授 (00512469)
谷 峻太郎 東京大学, 物性研究所, 助教 (80711572)
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Project Period (FY) |
2014-04-01 – 2018-03-31
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Keywords | テラヘルツ非線形光学 / テラヘルツ分光 / 非線形光学 / 半導体光学 / 超高速レーザー分光 / 高次高調波発生 |
Outline of Final Research Achievements |
In order to observe extreme nonlinear optical phenomena in solids, we have constructed two high-intensity terahertz light sources: one is a short pulse source which spectrum includes high frequency components over 20 THz and the other is a tunable narrow-bandwidth (< 0.1 THz) source with peak frequency of about 1 THz. With the tunable THz light source, we have confirmed a huge Rabi-splitting of 1s exciton level and sub-cycle light modulation in the exciton absorption. With high frequency source with 60 THz in peak energy, we observed high-harmonic generation in monolayer MoS2 and graphene for the first time. The high harmonics generation has unique properties that comes from solid state nature of electrons, which is quite different from that of the atomic gas system. We proposed theoretical models for these extreme nonlinear effects in solids.
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Free Research Field |
光物性物理学、テラヘルツ光科学
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