| 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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| 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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