2021 Fiscal Year Final Research Report
Exploration of quantum phenomena emerging at van der Waals superstructures
| Project/Area Number |
19H02593
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 29020:Thin film/surface and interfacial physical properties-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Masaki Nakano 東京大学, 大学院工学系研究科(工学部), 特任准教授 (70592228)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 薄膜・界面物性 / 二次元物質 / エピタキシー |
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| Outline of Final Research Achievements |
We explored quantum phenomena emerging when a material is thinned down to the two-dimensional (2D) limit. We in particular focused on transition-metal dichalcogenides, which are known to exhibit various types of properties depending on a combination of transition metals and chalcogens. By using molecular-beam epitaxy (MBE) technique that has been widely used in the field of semiconductors and oxides, we successfully realized layer-by-layer epitaxial growth of a wide variety of 2D materials including hardly-cleavable and thermally-metastable compounds, and revealed their electronic properties at the 2D limit. We also succeeded in fabrication of a magnetic van der Waals superstructure based on a 2D superconductor and a 2D ferromagnet by MBE, and demonstrated an emergent electronic ground state that could not be achieved by an individual material.
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| Free Research Field |
二次元物質科学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究成果の学術的意義としては、まず劈開が困難な物質や薄膜準安定相の超薄膜化に成功し、その2次元物性を解明した点が挙げられる。また、それらの物質を積層させたファンデルワールス超構造を作製し、単一物質では得られない特異な電子状態を実現した点にも大きな意義がある。一方、大局的な視点からは、2次元物質の大面積試料を作製するためのプロセスを確立した点に大きな意義がある。今後はこの大面積性を生かして、従来は試料サイズの関係で制限されていた物性評価手法の飛躍的拡大と、それに伴う2次元物性の理解の深化・発展、さらには様々な機能性デバイスの作製を通した応用研究の飛躍的発展などが期待される。
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