| Budget Amount *help |
¥45,890,000 (Direct Cost: ¥35,300,000、Indirect Cost: ¥10,590,000)
Fiscal Year 2014: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2013: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2012: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2011: ¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2010: ¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
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| Outline of Final Research Achievements |
We investigated the possibility of quantum degenerate phases, namely the exciton Bose-Einstein condensation and electron-hole (e-h) BCS sate, in photoexcited semiconductors. We intensively studied the behavior of exciton Mott crossover in terms of the crossover problem between these quantum degenerate phases by using the terahertz time-domain spectroscopy. We succeeded in the determination of exciton ionization ratio as a function of temperature and density, from which we determined the phase diagram of e-h system in the Mott crossover density regime. We revealed the signature of unscreened e-h correlation in the metallic e-h gas system which may be related to the precursor of e-h BCS paring. We also investigated the nonequilibrium dynamics of a superconductor. We discovered that after the nonadiabatic excitation with a monocycle terahertz pulse, an oscillation of the amplitude of the order parameter, namely the Higgs amplitude mode appears.
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