2015 Fiscal Year Final Research Report
Topological invariant in chiral superconductors
| Project/Area Number |
25800183
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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 | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | カイラル超伝導 / 量子アノマリー / チャーン不変量 |
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| Outline of Final Research Achievements |
We report the topological invariant in Sr2RuO4 nanoscale single crystals by measuring the electric transport properties. We observed the parity violation of current-voltage curves due to the excitation of the Majorana-Wyle fermions along the one-dimensional chiral edge current of single domain Sr2RuO4. In the absence of an external magnetic field, the two-dimensional surface transport in Sr2RuO4 thin films exhibited a fractional quantum Hall conductance in the superconducting state. The fractional magnetic-field-induced electric polarization was observed under zero bias current as the three-dimensional interlayer conduction. The fractional axion angle θ=π/6 is determined by observing the topological magneto-electric effect in Sr2RuO4 nanocrystals.
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| Free Research Field |
低次元電子物性
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