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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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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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 / トポロジカル量子輸送現象 / トポロジカル量子現象 / トポロジカル不変量 / メゾスコピック系 |
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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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Report
(4 results)
Research Products
(20 results)
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[Presentation] Chern structure in Sr2RuO4 thin films2015
Author(s)
H. Nobukane, T. Matsuyama and S. Tanda
Organizer
The 11th International Conference on Materials and Mechanisms of Superconductivity 2015
Place of Presentation
Geneva International Conference Center, Switzerland
Year and Date
2015-08-23 – 2015-08-28
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[Presentation] Topological transport in Sr2RuO42013
Author(s)
H. Nobukane, T. Matsuyama and S. Tanda
Organizer
International Workshop on Phase Transition, Critical Phenomena and Related Topics in Complex Networks
Place of Presentation
Hokkaido University, Sapporo
Related Report
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[Presentation] Tunneling Spectroscopy on λ-(BETS)2GaCl42013
Author(s)
Y. Oka, H. Nobukane, N. Matsunaga, K. Nomura, F. Sultana, A. Kobayashi and H. Kobayashi
Organizer
International Workshop on Phase Transition, Critical Phenomena and Related Topics in Complex Networks
Place of Presentation
Hokkaido University, Sapporo
Related Report
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