nonlinear optical responce from broken time reversal symmetry systems
| Project/Area Number |
15K04704
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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 |
Optical engineering, Photon science
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
Inoue Jun-ichi 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, 主幹研究員 (90323427)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 光誘起現象 / トポロジー / 量子ホール効果 / 光と物質の相互作用 / トポロジカル相 / フロケット状態 / 時間反転対称性のやぶれ / 非線形光学応答 / 動的対称性 / 時間依存問題 |
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| Outline of Final Research Achievements |
In recent extensive studies of emergent phenomena in solid-state systems, alteration of the symmetry inherent to a given system by applying an external time-dependent field is a central issue. We have found that how the time reversal symmetry is broken is not solely determined by temporal aspects, but also committed to spatial symmetry of the system. This connection between spatial and temporal symmetries induces various interesting phenomena that have not yet been discussed. This work reports one of these: symmetry-protected band sticking together in an effective- energy band structure of periodically driven electron systems. However, this, in turn, leads to another difficulty that conventional topological numbers cease to be well-defined. As such, we propose an alternative that is a natural extension of the previous one. To show validity, we confirmed firm consistency with well-established concepts.
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Report
(4 results)
Research Products
(5 results)
