| 研究課題/領域番号 |
22J22007
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| 配分区分 | 補助金 |
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| 研究機関 | 東京大学 |
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研究代表者 |
董 禹 東京大学, 工学系研究科, 特別研究員(DC1)
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| 研究期間 (年度) |
2022-04-22 – 2025-03-31
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| キーワード | 3R MoS2 / bulk photovoltaic effect / strain |
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| 研究実績の概要 |
In the past year, I focused on bulk piezophotovoltaic effect in 3R-MoS2. By straining 3R-MoS2, the rotational symmetry is broken, and we expect an in-plane polarization to arise. Thus, we observed the bulk piezophotovoltaic effect. The bulk photovoltaic (BPV) response is greatly enhanced by strain and the BPV coefficient increases at least two orders by 0.2% of strain. This work was published in Nature Nanotechnology in Nov 2022. Last year, I also carried out a research internship in Xiaodong Xu lab, University of Washington, where I learnt many useful skills in device fabrication and optical set-up construction.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
So far the progress of my research is smoothly proceeded as planned, though the specific material we researched on is adjusted. By the symmetry engineering strategy, we strained 3R MoS2, which has no inversion symmetry, to create an in-plane polarization. We successfully observed enhanced bulk photovoltaic effect (bulk piezophotovoltaic effect) and second harmonic generation to confirm the in-plane polarization. Besides 3R-MoS2, I have other two projects regarding on ferroelectric NbOI2 and magnet/magnet interface CrSBr/CrPS4 to carry on. In general, the progress of my research progress is good and on schedule.
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| 今後の研究の推進方策 |
In this year, I will continue on the research on ferroelectric NbOI2 and magnet/magnet interface CrSBr/CrPS4. The goal for NbOI2 is to observe switchable circular photogalvanic effect, and I am trying to clarify the influence of strain on NbOI2. As to CrSBr/CrPS4 interface, both of them are 2D magnets, but one has in-plane magnetic order and the other has out-of-plane magnetic order. The aim is to observe in-plane polarization induced by non-collinear spin structure via inverse DM effect. It is another important demonstration for the symmetry engineering strategy in van der Waals heterostructure.
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