Study of valley caloritoronics in transition metal dichalcogenides
| Project/Area Number |
17K18748
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics and related fields
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Ideue Toshiya 東京大学, 大学院工学系研究科(工学部), 助教 (90757014)
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| Project Period (FY) |
2017-06-30 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2017: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Keywords | 遷移金属ダイカルコゲナイド / バレートロニクス / 励起子 / 熱輸送 / ホール効果 / 二次元物質 |
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| Outline of Final Research Achievements |
We studied the characteristic valley transport originating from thermal or chemical potential gradient in a monolayer transition metal dichalcogenide, in which valley degree of freedom couples with circular polarized light or electron spin. We discovered that valley-polarized exciton can diffuse over several micrometers in a monolayer transition metal dichalcogenide and shows the valley-dependent Hall effect. In addition, we further studied the optical properties of the interface between a monolayer transition metal dichalcogenide and ferrimagnetic or antiferromagnetic insulators. We observed spin-dependent or magnon-mediated valley relaxation, which has been only studied in the interface of a monolayer transition metal dichalcogenide and ferromagnetic insulator so far. Our results pave a new way for studying the thermally driven valley transport and spin-related valley physics.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は、熱勾配や化学ポテンシャル勾配に由来するバレー輸送に着目したユニークな研究であり、発見した特徴的バレー輸送現象は、バレートロニクスの飛躍的発展に寄与する成果である。励起子ホール効果はバレー偏極励起子流の方向制御に有望であると同時に、バレー流生成の基本的手法になり得る可能性があり、本現象を契機としたバレートロニクス研究の新展開が期待される。また、遷移金属ダイカルコゲナイドとフェリ磁性体や反強磁性体の界面において観測した特徴的バレー・スピン緩和現象は、バレートロニクスとスピントロニクスを橋渡しする重要な成果であり、今後他分野とのさらなる学理融合と相互発展が望まれる。
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Report
(3 results)
Research Products
(25 results)
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[Presentation] Thermal Hall effect in magnetic insulators2018
Author(s)
Toshiya Ideue
Organizer
The 16th International Conference on Phonon Scattering in Condensed Matter (Phonons 2018) & The 4th International Conference on Phononics and Thermal Energy Science (PTES2016)
Related Report
Int'l Joint Research / Invited
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