2015 Fiscal Year Final Research Report
Elucidation of the time-space evolution processes for the photo-induced phase transition in titanium oxides
| Project/Area Number |
25400315
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Nihon University (2014-2015)
University of Tsukuba (2013) |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 光誘起相転移 / 超高速分光 / イメージング測定 / チタン酸化物 / マグネリ相 / THz測定 / 結晶成長 |
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| Outline of Final Research Achievements |
We studied the photo-induced phase transition (PIPT) dynamics in Ti4O7 through time-resolved reflection spectroscopy and imaging methods, where the single crystals were fabricated by our systematic procedures. The photo-irradiation in the low temperature phase and intermediate phase induced spontaneous domain growth of the induced high temperature metallic phase. Our analysis indicate that the growth process includes two steps, the first step caused by electron-lattice interactions, and the second caused by the acoustic phonon in the core titanium dioxide.
The PIPT was also investigated using a terahertz-probe technique, which is sensitive for appearance of metallic phase. The photo-irradiation in the low temperature phase induces an ultrafast decrease in the probe transmittance, corresponding to the generation of a metallic domain. Thus we reconfirm our interpretation through the nonlinear properties of the transmission amplitudes and lifetime components on the excitation density.
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| Free Research Field |
光物性物理学
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