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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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2019: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
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| Keywords | 薄膜・界面物性 / 二次元物質 / エピタキシー / 2次元物質 |
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| Outline of Research at the Start |
物質をわずか一層にまで薄くした際に発現する物性や機能の開拓に取り組む。特に、グラフェンに代表される2次元物質のエピタキシャル成長を通して、劈開が困難な物質の単層化や、天然には存在しない組成や構造を持つ新奇量子物質の人工合成を実現すると共に、電界効果ドーピングによる電子相制御と新奇デバイス機能の開拓に取り組む。さらに、異なる2次元物質を積層させたファンデルワールス超構造を構築し、電子の個々としての性質であるスピンやバレー、あるいは波動関数のトポロジーといった量子力学的な特徴と、電子の集団としての性質である超伝導や磁性などの強相関物性を融合させることで、単一物質では得られない物性や機能を創出する。
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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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| 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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Report
(4 results)
Research Products
(78 results)
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[Journal Article] Total reflection hard x-ray photoelectron spectroscopy: Applications to strongly correlated electron systems2021
Author(s)
T. Mizutani, S. Tanaka, T. Saze, K. Fujii, H. Matsuoka, M. Nakano, H. Wadati, M. Kitamura, K. Horiba, Y. Iwasa, H. Kumigashira, M. Yoshiki, M. Taguchi
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Journal Title
Physical Review B
Volume: 103
Issue: 20
Pages: 205113-205113
DOI
Related Report
Peer Reviewed
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[Presentation] Spin-orbit induced magnetic modulation at the V5Se8 / NbSe2 van der Waals heterostructures2022
Author(s)
Hideki Matsuoka, Masaki Nakano, Stewart E Barnes, Jun'ichi Ieda, Sadamichi Maekawa, Mohammad S Bahramy, Bruno S. Kenichi, Yukiharu Takeda, Hiroki Wadati, Yue Wang, Satoshi Yoshida, Kyoko Ishizaka, Yoshihiro Iwasa
Organizer
The March Meeting 2022 of the American Physical Society
Related Report
Int'l Joint Research
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[Presentation] Electronic structure of Cr1/3NbSe2 epitaxial thin films studied by angle-resolved photoemission spectroscopy2022
Author(s)
Bruno K Saika, Satoshi Hamao, Hideki Matsuoka, Masaki Nakano, Miho Kitamura, Masato Sakano, Takuya Nomoto, Motoaki Hirayama, Koji Horiba, Hiroshi Kumigashira, Ryotaro Arita, Yoshihiro Iwasa, Kyoko Ishizaka
Organizer
The March Meeting 2022 of the American Physical Society
Related Report
Int'l Joint Research
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[Presentation] Zeeman-type spin-orbit interaction induced Ising ferromagnetism at a van der Waals interface2021
Author(s)
Hideki Matsuoka, Masaki Nakano, Stewart Edward Barnes, Jun'ichi Ieda, Sadamichi Maekawa, Mohammad Saeed Bahramy, Bruno Kenichi Saika, Yukiharu Takeda, Hiroki Wadati, Yue Wang, Satoshi Yoshida, Kyoko Ishizaka, Yoshihiro Iwasa
Organizer
The 60th Anniversary Fullerenes-Nanotubes-Graphene General Symposium
Related Report
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[Presentation] Electronic structure of CrxNbSe2 epitaxial thin films studied by angle-resolved photoemission spectroscopy2021
Author(s)
Bruno Kenichi Saika, Satoshi Hamao, Yuki Majima, Hideki Matsuoka, Masaki Nakano, Satoshi Yoshida, Masato Sakano, Koji Horiba, Hiroshi Kumigashira, Yoshihiro Iwasa, Kyoko Ishizaka
Organizer
日本物理学会 第76回年次大会
Related Report
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[Presentation] The crossover between the orbital and paramagnetic limits in angle dependence of Hc2 of 2D NbSe22021
Author(s)
Hideki Matsuoka, Masaki Nakano, Takashi Shitaokoshi, Takumi Ouchi, Yue Wang, Yuta Kashiwabara, Satoshi Yoshida, Kyoko Ishizaka, Masashi Kawasaki, Yoshimitsu Kohama, Tsutomu Nojima, Yoshihiro Iwasa
Organizer
The March Meeting 2021 of the American Physical Society
Related Report
Int'l Joint Research
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[Presentation] Angle-resolved photoemission spectroscopy study of single-layer TaTe2 grown by molecular-beam epitaxy2020
Author(s)
Bruno Kenichi Saika, Satoshi Yoshida, Natsuki Mitsuishi, Masato Sakano, Yuita Fujisawa, Yoshinori Okada, Yue Wang, Hideki Matsuoka, Masaki Nakano, Yoshihiro Iwasa, Kyoko Ishizaka
Organizer
日本物理学会 2020年秋季大会
Related Report
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[Presentation] Magnetism in layered transition-metal chalcogenide thin films grown by molecular-beam epitaxy2019
Author(s)
Yue Wang, Masaki Nakano, Satoshi Yoshida, Mohammad Saeed Bahramy, Hideki Matsuoka, Yuki Majima, Yuta Ohigashi, Yuta Kashiwabara, Masato Sakano, Kyoko Ishizaka, and Yoshihiro Iwasa
Organizer
CEMS Symposium on Emergent Quantum Materials
Related Report
Int'l Joint Research
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[Presentation] NbSe2超薄膜におけるPauli極限-軌道極限のクロスオーバー2019
Author(s)
松岡秀樹, 中野匡規, 小濱芳允, 王越, 柏原悠太, 吉田訓, 松井一樹, 下起敬史, 大内拓, 石坂香子, 野島勉, 川﨑雅司, 岩佐義宏
Organizer
日本物理学会 2019年秋季大会
Related Report
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[Presentation] 全反射条件下での硬X線光電子分光(HAXPES)：強相関電子系材料への応用2019
Author(s)
田口宗孝, 佐瀬輝彦, 田中哲, 松岡秀樹, 中野匡規, 和達大樹, 堀場弘司, 北村未歩, 岩佐義宏, 組頭広志, 吉木昌彦
Organizer
日本物理学会 2019年秋季大会
Related Report
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[Presentation] 二次元超伝導体NbSe2におけるパウリ極限の角度依存性2019
Author(s)
松岡秀樹, 中野匡規, 小濱芳允, 王越, 柏原悠太, 吉田訓, 松井一樹, 下起敬史, 大内拓, 石坂香子, 野島勉, 川﨑雅司, 岩佐義宏
Organizer
第80回 応用物理学会 秋季学術講演会
Related Report
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[Presentation] Angle dependent Pauli-paramagnetic limit in ultra-thin NbSe22019
Author(s)
Hideki Matsuoka, Masaki Nakano, Yoshimitsu Kohama, Yue Wang, Yuta Kashiwabara, Satoshi Yoshida, Kazuki Matsui, Takashi Shitaokoshi, Takumi Ouchi, Kyoko Ishizaka, Tsutomu Nojima, Masashi Kawasaki, Yoshihiro Iwasa
Organizer
11th Conference on Recent Progress in Graphene and 2D Materials Research
Related Report
Int'l Joint Research
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[Presentation] Crossover between Orbital limit and Pauli-paramagnetic limit in ultra-thin NbSe22019
Author(s)
Hideki Matsuoka, Masaki Nakano, Yoshimitsu Kohama, Yue Wang, Yuta Kashiwabara, Satoshi Yoshida, Kazuki Matsui, Takashi Shitaokoshi, Takumi Ouchi, Kyoko Ishizaka, Tsutomu Nojima, Masashi Kawasaki, Yoshihiro Iwasa
Organizer
Materials Research Meeting 2019
Related Report
Int'l Joint Research
