Nonperturbative quantum effects in Dirac materials
| Project/Area Number |
15H06023
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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 | Tohoku University |
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Principal Investigator |
Araki Yasufumi 東北大学, 学際科学フロンティア研究所, 助教 (10757131)
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| Co-Investigator(Renkei-kenkyūsha) |
NOMURA Kentaro 東北大学, 金属材料研究所, 准教授 (00455776)
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| Research Collaborator |
YOSHIDA Akihide
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| Project Period (FY) |
2015-08-28 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 物性理論 / 強相関電子系 / スピンエレクトロニクス / 半導体物性 / トポロジカル物質 / ディラック電子 / 磁壁 / 物性物理 / スピントロニクス / ディラック電子系 / トポロジカル絶縁体 / ワイル半金属 / 磁性 / スピン波 / 反強磁性体 |
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| Outline of Final Research Achievements |
The goal of this project was to understand the interaction effects on electrons in "Dirac materials" including topological insulators and Dirac-Weyl semimetals, from the point of view of quantum field theory. I found the following three points: (1) The Coulomb interaction between electrons turns the system into an insulator, and renormalizes the electron Fermi velocity. (2) The exchange interaction between electron spins and local spins leads to a nontrivial effective exchange interaction between the local spins. (3) A magnetic domain wall formed in Weyl semimetals hosts a finite localized charge, and its motion can be driven by an external electric field.
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Report
(3 results)
Research Products
(17 results)
