| Budget Amount *help |
¥19,630,000 (Direct Cost: ¥15,100,000、Indirect Cost: ¥4,530,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000)
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| Outline of Final Research Achievements |
The high-pressure electric polarization measurements of the spin dimer systems TlCuCl3 have revealed that the quantum fluctuation inherent in the spin dimer enhances the electric polarization, induced by the antiferromagnetic order owing to the magnon Bose-Einstein condensation, and gives soft nature to the ferroelectricity. By utilizing the soft nature, we have succeeded in fast switching of the nonreciprocal directional response to the microwave by the reversal of the electric polarization. We also have found that the optical transition from the spin singlet to the triplet state in KCuCl3 is induced by the oscillating electric fields of the terahertz electromagnetic wave.
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