2016 Fiscal Year Final Research Report
Magnetism and superconductivity induced by holes introduced to Mott insulator
Project/Area Number |
26400411
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Mathematical physics/Fundamental condensed matter physics
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Research Institution | Toyota Technological Institute |
Principal Investigator |
Takano Ken'ichi 豊田工業大学, 工学(系)研究科(研究院), 教授 (00197112)
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Project Period (FY) |
2014-04-01 – 2017-03-31
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Keywords | モット絶縁体 / ホールとスピンの束縛状態 / t-Jモデル |
Outline of Final Research Achievements |
We investigated the motion of holes which are introduced in Mott insulator by doping. Such a hole moves in the surrounding electrons, strongly interacting with the electronic spins. By numerical analysis, we confirmed that one hole and spins form a bound state which behaves as a composite particle with spin S=1, 2, 3, ... . The spin magnitude of a composite particle depends on the values of parameters in the Hamiltonian. Two S=1 composite particles exist almost independently. Two composite particles with S more than 1 aggregate to a single ferromagnetic area. We further constructed the phase diagram for finite hole density by numerical calculation.
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Free Research Field |
物性基礎論
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