2017 Fiscal Year Final Research Report
Hybrid manipulation of solids by using 6 fs near infrared and teraheltz lights
| Project/Area Number |
16K13814
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics I
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Keywords | 強相関電子系 / 光誘起相転移 / 超高速現象 / 有機伝導体 / 遷移金属酸化物 |
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| Outline of Final Research Achievements |
i)Polarization selectivity of light-field-induced charge localization was investigated in an organic metal α-(BEDT-TTF)2I3 with a triangular lattice. Dependences of transient reflectivity spectra on polarizations of the 7-fs pump and probe lights indicate that a short-range charge order (CO) is efficiently induced from the metallic phase for the pump polarization perpendicular to the 1010-type CO axis. ii)The time-domain waveform of the terahertz (THz) electric field emitted from the same compound can be significantly modulated depending on incident fluence of femtosecond pulses. As revealed by time-resolved experiments, this modulation arises from the cooperative nature of photoinduced melting of the charge order accompanying quenching of infrared-activity of the intermolecular vibrations which strongly couple with the emission. iii)We have shown that the phonon absorption (for a short-range) and the THz generation (for a long-range) are available for detecting strong field effects.
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| Free Research Field |
光物性実験、超高速分光
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