2017 Fiscal Year Final Research Report
Theory of quantum conducting states and optical responses by space-time inversion breaking
| Project/Area Number |
15K05176
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Meiji University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
求 幸年 東京大学, 大学院工学系研究科(工学部), 教授 (40323274)
速水 賢 北海道大学, 理学研究院, 助教 (20776546)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 多極子 / 奇パリティ / スピン軌道相互作用 / 時空反転対称性 / トポロジー / 電気・電流磁気効果 / バレー選択型光学応答 / 混成軌道 |
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| Outline of Final Research Achievements |
We have developed the quantum-conducting phenomena and exotic optical responses driven by spontaneous symmetry breaking of space-time inversion symmetry for f- and d-electron systems with strong spin-orbit coupling. We have elucidated their mechanism from the microscopic point of view. Especially, we have achieved the following results: (1) the prediction of magneto-current effect in UNi4B showing vortex-like magnetic ordering, which is regards as the ferroic toroidal ordering, (2) the prediction of non-reciprocal magnon in the zig-zag structure corresponding to α-Cu2V2O7, (3) microscopic understanding for peculiar magneto-electric effect observed in Co4Nb2O9, (4) comprehensive understanding of cross correlations based on two-band Hubbard model on the honeycomb lattice. Moreover, we have developed the theoretical framework of argumented multipoles, namely, cluster and hybrid multipoles, which are very useful to analyze a variety of cross-correlated phenomena in s
systematic way.
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| Free Research Field |
物性理論
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