Coherent control of nonequilibrium BCS state by intense THz pulse
| Project/Area Number |
25800175
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | 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 |
MATSUNAGA Ryusuke 東京大学, 理学(系)研究科(研究院), 助教 (50615309)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | テラヘルツ分光 / ヒッグスモード / 超伝導 |
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| Outline of Final Research Achievements |
We realized nonadiabatic excitation to an s-wave superconductor NbTiN by using an intense monocycle THz pulse, and reported time-resolved observation of the Higgs mode as a free oscillation of the order parameter amplitude after the nonadiabatic perturbation. This collective mode is a condensed matter analog of the Higgs bosons in particle physics. We also examined the dynamics of the order parameter during the irradiation of the strong THz electric field, and showed that strong sub-gap electric field induces forced oscillation of the order parameter with twice the pump frequency, accompanied by third harmonics generation (THG). We found that the forced oscillation and THG are strongly enhanced when the nonlinear driving frequency is equal to the Higgs mode frequency. This result is the first discovery of the resonance between light and Higgs mode in nonlinear response regime and paves a way for ultrafast control of macroscopic quantum condensates by light.
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Report
(3 results)
Research Products
(19 results)
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[Presentation] Higgs Mode and Terahertz Nonlinear Optics in Superconductors2014
Author(s)
Ryo Shimano, Ryusuke Matsunaga, Yuki Hamada, Arata Sugioka, Hiroyuki Fujita, Kazumasa Makise, Yoshinori Uzawa, Hirotaka Terai, Zhen Wang, Naoto Tsuji, and Hideo Aoki
Organizer
19th International Conference on Ultrafast Phenomena
Place of Presentation
沖縄コンベンションセンター（沖縄県宜野湾市
Year and Date
2014-07-07 – 2014-07-11
Related Report
Invited
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