| Project/Area Number |
15K17702
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YAMAJI Youhei 東京大学, 大学院工学系研究科(工学部), 准教授 (00649428)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 遷移金属酸化物 / スピン軌道相互作用 / 磁壁 / トポロジカル絶縁体 / 機能性界面 / 強相関電子系 / イリジウム酸化物 / 磁性 |
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| Outline of Final Research Achievements |
Spontaneous symmetry breakings, metal-insulator transitions, and transport properties of magnetic-domain wall states in pyrochlore iridium oxides are studied by employing a symmetry-adapted effective Hamiltonian with a slab of the pyrochlore structure. Emergent metallic domain wall, which has an unconventional topological nature with a controllable and mobile metallic layer, is shown to host Fermi surfaces with modulated helical spin textures resembling Rashba metals. The helical nature of the domain-wall Fermi surfaces is experimentally detectable by anomalous Hall conductivity, circular dichroism, and optical Hall conductivity under external magnetic fields. Possible applications of the domain-wall metals to spin-current generation and “half-metallic” conduction are also discussed. The controllability of the domain walls is also clarified.
In addition to the iridium oxides, pair-annihilation of Weyl electrons and the emergence are studied in other pyrochlore transition metal oxides.
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