Elucidation of the time-space evolution processes for the photo-induced phase transition in titanium oxides
| Project/Area Number |
25400315
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Condensed matter physics I
|
|---|
| Research Institution | Nihon University (2014-2015)
University of Tsukuba (2013) |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
|
|---|
| 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 / 絶縁体－金属転移 / マグネリ相チタン酸化物 / Ti4O7 / 時間分解イメージング / THz分光 / 単結晶試料作成 / 酸化チタン / 時間分解測定 / 超短パルス / イメージング |
|---|
| 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.
|
Report
(4 results)
Research Products
(6 results)
