2009 Fiscal Year Final Research Report
Study of density wave dynamics in organic conductors by optical pump and terahertz probe experiments
| Project/Area Number |
20740170
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics I
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| Research Institution | The University of Tokyo |
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Principal Investigator |
WATANABE Shinichi The University of Tokyo, 大学院・理学系研究科, 助教 (10376535)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 有機導体 / スピン密度波 / テラヘルツ分光 / ポンプ・プローブ計測 / 光物性 |
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| Research Abstract |
Photoexcited dynamics of the spin density-wave (SDW) state in a linear-chain compound bis-(tetramethyl-tetraselenafulvalene)hexafluorophosphate, (TMTSF)_2PF_6, is investigated by optical pump and terahertz probe experiments. After the ultrashort laser-pulse excitation, a sudden closing followed by a recovery of the SDW gap is clearly observed in the far-infrared spectrum. The recovery time is found to diverge toward the phase-transition temperature, T_<SDW>, while the gap remains open at T_<SDW>. The observed critical slowing down behavior is interpreted in terms of fluctuation which enlarges near the phase transition temperature.
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