2010 Fiscal Year Final Research Report
Theory for Photoinduced Phase Transition Dynamics in Molecular Low-Dimensional Conductors
| Project/Area Number |
19540381
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Institute for Molecular Science |
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Principal Investigator |
YONEMITSU Kenji Institute for Molecular Science, 理論・計算分子科学研究領域, 准教授 (60270823)
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| Co-Investigator(Renkei-kenkyūsha) |
TANAKA Yasuhiro 分子科学研究所, 理論・計算分子科学研究領域, 助教 (50541801)
YAMASHITA Yasufumi 分子科学研究所, 理論・計算分子科学研究領域, 助教 (50390646)
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| Project Period (FY) |
2007 – 2010
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| Keywords | 分子性固体 / 有機導体 / 光誘起相転移 / 電荷秩序 / 絶縁体金属転移 |
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| Research Abstract |
Mechanisms for photoinduced and ultrafast modulation of transport, dielectric, and magnetic properties of molecule-based materials are theoretically clarified. We describe how frozen electrons in insulators are melted by photoirradiation and become itinerant. The obtained results explain experimentally observed behaviors from the early stage to picoseconds timescales. Roles of couplings to lattice phonons and to molecular vibrations are clarified in strongly correlated electron systems. In addition, we propose a method for nonequilibrium steady states by which electronic orders and nonlinear transport properties are self-consistently described. The rectification behavior depends on the mechanism by which the material becomes an insulator. The mechanism responsible for the dielectric breakdown depends on the system size.
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