| Project/Area Number |
16H06590
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | Hokkaido University |
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Principal Investigator |
Hayami Satoru 北海道大学, 理学研究院, 助教 (20776546)
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| Project Period (FY) |
2016-08-26 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 強相関電子系 / 磁性 / 反対称スピン軌道相互作用 / トロイダルモーメント / 多極子 / 局所的な反転対称性の破れ / マルチフェロイクス / 遍歴電子系 / スピン軌道相互作用 / 多極子秩序 / 空間反転対称性 / スピンエレクトロニクス / 物性理論 |
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| Outline of Final Research Achievements |
We microscopically formulated toroidal moments in the absence of time-reversal and spatial inversion symmetries. We also investigated how to observe and control toroidal moments in experiments from the theoretical side. (1)We derived an effective spin-orbit coupling under the toroidal ordering for the model including the crystalline-electric field, atomic spin-orbit coupling, and electron correlation by perturbative analysis. (2) We clarified that toroidal moments are induced around the nonmagnetic impurity site in the ferromagnets with the strong spin-orbit coupling on the triangular lattice. (3) We examined the 5d transition oxide KOsO4, which is a potential candidate showing toroidal moments.
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