| Budget Amount *help |
¥42,770,000 (Direct Cost: ¥32,900,000、Indirect Cost: ¥9,870,000)
Fiscal Year 2018: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2017: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
Fiscal Year 2016: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2015: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
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| Outline of Final Research Achievements |
Pump-probe optical measurements utilizing cutting-edge near infrared light-source (pulse width =6 fs, 1.3 cycle) have been performed for investigating strong light field effects in strongly correlated materials. i) Charge localization induced by a light field is observed in organic conductors (α-(BEDT-TTF)2I3, (TMTTF)2AsF6) and the mechanism is clarified by using many-body quantum mechanical analyses.
ii) In an organic superconductor(κ-(BEDT-TTF)2(Cu[N(CN)2]Br), a stimulated emission is observed under strong excitation of 10 MV/cm2.It is noteworthy the temperature dependence of the intensity of this stimulated emission at 10 fs shows anomalous increase near the superconducting temperature. This fact indicates that the microscopic mechanism is related to the Coulomb repulsion (or charge fluctuation), considering that the time scale of 10 fs corresponds to 0.4 eV. We theoretically clarified that the origin of the stimulated emission is a synchronized nonlinear charge motion.
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