| 研究課題/領域番号 |
21K13865
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分13020:半導体、光物性および原子物理関連
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| 研究機関 | 東京工業大学 |
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研究代表者 |
Zhang Tiantian 東京工業大学, 理学院, 特任助教 (50875101)
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| 研究期間 (年度) |
2021-04-01 – 2023-03-31
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| 研究課題ステータス |
完了 (2022年度)
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| 配分額 *注記 |
3,380千円 (直接経費: 2,600千円、間接経費: 780千円)
2022年度: 1,690千円 (直接経費: 1,300千円、間接経費: 390千円)
2021年度: 1,690千円 (直接経費: 1,300千円、間接経費: 390千円)
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| キーワード | Z2 Dirac points / node-line surface states / chiral phonon theory / truly chiral phonons / new surface states / kagome node-line metal / topological band theory / topological materials / Dirac points / chiral phonon / DFT calculation / DFT / chiral phonons / topological material / phononic material |
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| 研究開始時の研究の概要 |
Phonons are also important (quasi)particles in solids, but studies on their topology are not as much as in electrons. They have unique properties which may lead to discoveries of new topological aspects of phonons, such as new quantum degrees of freedoms (e.g., pseudospin), phonon angular momentum, fragile topological phonons.
We will theoretically explore new aspects of topological phonons, including new topological aspects, searching and studying for materials with new topological phonons, collaborations with experimental groups, and extending the results of phonons to other quasiparticles.
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| 研究成果の概要 |
I proposed node-line surface phonon material SnIP, kagome node-line metal Ni3In2S2, Z2 Dirac point with multi-helicoid surface states. I built the theory for chiral phonons in non-symmorphic systems and systems with approximate screw symmetry, and demonstrate the truly chiral phonon in HgS.
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| 研究成果の学術的意義や社会的意義 |
The first proposed node-line surface phonon material SnIP and Z2 Dirac point with multi-helicoid surface states promote the topological band theory. Theories on chiral phonons in non-symmorphic/approximate symmetry systems will triger follow-up studies, and open new avenues in this field.
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