| Budget Amount *help |
¥23,920,000 (Direct Cost: ¥18,400,000、Indirect Cost: ¥5,520,000)
Fiscal Year 2018: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2016: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2015: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
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| Outline of Final Research Achievements |
We have investigated the collective excitation mode of order parameter amplitude associated with spontaneous symmetry breaking in superconductor, namely the Higgs mode, by using the state-of-the-art technology of intense terahertz pulse generation. We clarified the dominant contribution of the Higgs mode on nonlinear terahertz response in s-wave superconductor, indicating that the contribution of the Higgs mode is significantly underestimated in the BCS mean-field approximation. Infrared activation of the Higgs mode under strong supercurrent was also observed experimentally. We also succeeded the observation of the Higgs mode in a d-wave superconductor cuprate for the first time and investigated nonequilibrium dynamics of c-axis Josephson plasma resonance in cuprates.
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