Theory of photoinduced superconductivity and nonequilibrium phase transition in complex correlated quantum systems
Project/Area Number |
25800192
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Condensed matter physics II
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Research Institution | Institute of Physical and Chemical Research (2015) The University of Tokyo (2013-2014) |
Principal Investigator |
Tsuji Naoto 国立研究開発法人理化学研究所, 創発物性科学研究センター, 研究員 (90647752)
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Project Period (FY) |
2013-04-01 – 2016-03-31
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Project Status |
Completed (Fiscal Year 2015)
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Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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Keywords | 超伝導 / 動的平均場理論 / 非平衡 / 光誘起超伝導 / 光誘起相転移 |
Outline of Final Research Achievements |
We reveal that there exists a supersolid phase (coexistence of superconductivity and charge order) accompanied by a quantum critical point in strongly coupled electron-phonon systems. Using the nonequilibrium dynamical mean-field theory, we show that the superconducting phase has a new collective amplitude mode hybridizing with a phonon oscillation, in addition to the Higgs amplitude mode. We also show that when the superconducting phase is driven by an oscillating electric field, the superconducting order parameter is forced to oscillate with a doubled frequency. The forced oscillation can be resonantly enhanced when the doubled frequency coincides with the Higgs mode frequency. This phenomenon has been observed in a THz laser experiment.
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Report
(4 results)
Research Products
(71 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 (UP2014)
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
2014-07-10
Related Report
Invited
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