2015 Fiscal Year Final Research Report
Novel phenomena of topological phases in superconductors, magnets, and Mott insulators
| Project/Area Number |
23540406
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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 | Osaka University (2014-2015)
Kyoto University (2011-2013) |
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Principal Investigator |
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| Project Period (FY) |
2011-04-28 – 2016-03-31
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| Keywords | トポロジカル絶縁体 / トポロジカル超伝導 / Berry位相 / 電子相関 |
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| Outline of Final Research Achievements |
We have investigated theoretically novel quantum phenomena in solids with topologically nontrivial electronic structures. We have predicted the following phenomena, and confirmed a part of them via the collaboration with experimental groups. (1) Giant thermoelectric effect due to Berry phase fluctuation in chiral superconductors. It is noted that the figure of merit of this effect is largest among all previously known superconductors, and thus this finding is important for future applications to thermoelectric devices. We have confirmed this effect experimentally for the heavy fermion superconductor URu2Si2 via the collaboration with the experimental group conducted by Prof. Matsuda in Kyoto University. (2) Emergent electromagnetic phenomena induced by skyrmion-monpole textures in chiral magnets. (3) A novel transport phenomenon in Weyl semimetals with topological defects, which is referred to as torsional chiral magnetic effect.
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| Free Research Field |
物性物理学
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