2020 Fiscal Year Final Research Report
Detecting feeble signal utilizing stochastic resonance in hydrogen-bonded molecular conductors and its application
Project/Area Number |
19K22123
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Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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Allocation Type | Multi-year Fund |
Review Section |
Medium-sized Section 29:Applied condensed matter physics and related fields
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Research Institution | The University of Tokyo |
Principal Investigator |
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Project Period (FY) |
2019-06-28 – 2021-03-31
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Keywords | 水素結合 / モット絶縁体 / 確率共鳴現象 / 量子常誘電 / 量子スピン液体 / 有機導体 / 誘電率 |
Outline of Final Research Achievements |
In this study, we performed dielectric permittivity and magnetic susceptibility measurements down to very low temperatures in a series of hydrogen-bonded Mott insulators, and revealed that a new quantum liquid state in which a quantum paraelectric and quantum paramagnetic state coexists has been realized in these materials. The quantum spin liquid state due to the proton degree of freedom found in this study is a new type quantum spin liquid state based on the third degree of freedom other than the electronic degrees of freedom such as charges and orbitals and the structural degrees of freedom due to disorder. This is an interesting mechanism for a novel quantum liquid state related to the remarkable quantum nature of the proton, that is, the lightest ion in all atoms.
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Free Research Field |
物性物理学
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Academic Significance and Societal Importance of the Research Achievements |
量子スピン液体は高温超伝導との関連も指摘されており、その発現機構の解明は物性物理学における重要な研究課題である。特に二次元三角格子において、どのような機構により、量子スピン液体状態が安定化するのかを明らかにすることは極めて重要な課題である。本研究成果は、量子スピン液体安定化のメカニズムとして、電子自由度や乱れではない、第3の自由度であるプロトン自由度を提唱するものであり、量子スピン液体の実現に対して、新たな設計指針を与えるものである。
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