| Budget Amount *help |
¥19,890,000 (Direct Cost: ¥15,300,000、Indirect Cost: ¥4,590,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
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| Outline of Final Research Achievements |
We have demonstrated that a dynamic magneto-electric phenomenon called "electromagnon", for which magnon is excited by the electric component of light, can be driven by dynamics of the vector spin chirality in the frustrated magnet. Furthermore, we suggested that such a phenomenon also occurs in quantum spin gap systems due to the spin current mechanism, which brings about a electric polarization proportional to the vector spin chirality. According to this idea, we succeeded in observing ferroelectricity induced by Bose-Einstein condensation of magnon quasi-particles.
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