| Project/Area Number |
23686023
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Kyoto University |
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Principal Investigator |
SHIMADA Takahiro 京都大学, 工学(系)研究科(研究院), 助教 (20534259)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥27,950,000 (Direct Cost: ¥21,500,000、Indirect Cost: ¥6,450,000)
Fiscal Year 2013: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2011: ¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
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| Keywords | 低次元構造体 / 強誘電体 / ナノスケール / マルチフィジックス特性 / 第一原理解析 / 分子動力学 / ひずみ / 機械的特性 |
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| Research Abstract |
In this study, novel ferroelectric properties in low-dimensional nanostructures are analyzed by large-scale quantum-mechanics simulations using parallel computations. A novel vortex-like polarization structure, which is totally different from that of the bulk counterpart, is successfully observed in all nanostructures such as nano-films, nanowires, nanotubes, and nanodots. The properties are found to be strongly dependent on the shape of components. Furthermore, the coupling between this novel ferroelectric properties and mechanica strain, i.e., multi-physics properties, is analyzed. It is revealed that the presence, strength, and numbers of polarization vortices change with respect to the strain. This indicates that there exist remarkable multi-physics properties in low-dimensional ferroelectric nanostructures.
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