2019 Fiscal Year Final Research Report
Theoretical study on nonequilibrium property of vortices hosted a Majorana fermion
| Project/Area Number |
15K17715
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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 | Institute of Physical and Chemical Research (2018-2019)
The University of Tokyo (2015-2017) |
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Principal Investigator |
Tsutsumi Yasumasa 国立研究開発法人理化学研究所, 創発物性科学研究センター, 研究員 (10631781)
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| Project Period (FY) |
2015-04-01 – 2020-03-31
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| Keywords | 不純物効果 / 交流応答 / トポロジカル超伝導 / Keldyshグリーン関数 |
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| Outline of Final Research Achievements |
Impurity effect for Majorana fermions hosted by vortices in topological superconductors has been clarified. The flux-flow resistivity is influenced by the impurity effect given by the coherence factor of the Majorana fermions. Non-equilibrium properties of the Majorana fermions under ac electric field has also been clarified by using a developed program to calculate Green's functions in the Keldysh formalism.
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| Free Research Field |
物性理論
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の成果により、マヨラナフェルミオンの干渉に関する性質を決めるコヒーレンス因子が動的性質に重要な寄与をすることが明らかになった。干渉効果は量子力学的な性質であり、マヨラナフェルミオンでは生成と消滅の演算子が等しいという際立った特徴を直接観測する道を拓く。コヒーレンス因子は、中性子非弾性散乱や準粒子干渉を利用すれば観測できると期待される。
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