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2020 Fiscal Year Final Research Report

High-pressure study of exciton condensation and superconductivity

Research Project

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Project/Area Number 18H01172
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionThe University of Electro-Communications

Principal Investigator

Matsubayashi Kazuyuki  電気通信大学, 大学院情報理工学研究科, 准教授 (10451890)

Co-Investigator(Kenkyū-buntansha) 片山 尚幸  名古屋大学, 工学研究科, 准教授 (50623758)
北川 健太郎  東京大学, 大学院理学系研究科(理学部), 講師 (90567661)
Project Period (FY) 2018-04-01 – 2021-03-31
Keywords励起子 / 圧力誘起超伝導 / 半導体-半金属転移
Outline of Final Research Achievements

We have constructed a comprehensive pressure-temperature phase diagram of the excitonic insulator Ta2NiSe5. In particular, a partial gap involving electron-lattice interaction appears in the high-pressure semimetallic phase, and superconductivity emerges around a critical pressure where the collapse of the gap is observed. We have also discovered pressure-induced superconductivity in BiS2-based layered compounds located near the semiconductor-semimetal transition and observed the similar phase diagram for Ta2NiSe5.

Free Research Field

高圧力下物性

Academic Significance and Societal Importance of the Research Achievements

本研究では、電子と正孔の対形成による励起子と電子同士が対形成した超伝導クーパー対の量子凝縮相を同一物質中で圧力のみを制御することで観測することに初めて実験的に成功した。本研究の成果は半導体と半金属の境界領域で発現する多彩な量子相の形成に、クーロン引力と電子-格子相互作用が重要な役割を果たしていることを示唆しており、今後の物質開発に対して新たな指針を提供すると期待される。

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Published: 2022-01-27  

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