2019 Fiscal Year Final Research Report
Theoretical study aiming to detect and control Majorana quasiparticles in topological superconductors
| Project/Area Number |
16K17755
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | Osaka University (2019)
Kyoto University (2017-2018)
National Institute for Materials Science (2016) |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2016-04-01 – 2020-03-31
|
| Keywords | トポロジカル超伝導 / マヨラナ準粒子励起 / トポロジカル半金属 |
|---|
| Outline of Final Research Achievements |
We theoretically investigated superconductivity in topological materials and their Majorana quasiparticle excitation, on the basis of symmetry consideration and numerical solution of the Bogoliubov-de Gennes equation and gap equation. In particular, we pointed out that recently discovered superconducting anti-perovskite material Sr3SnO can be a novel topological superconductor characterized by large winding number. It was also shown that iron-based superconductors can have a variety of Majorana quasiparticles protected by crystalline symmetry, such as Majorana quartet, Majorana flat band, and Moebius surface states. In addition, we studied the nodal line semimetal phase in photonic crystal system.
|
| Free Research Field |
物性理論
|
| Academic Significance and Societal Importance of the Research Achievements |
逆ペロブスカイト物質や鉄系超伝導などの現在実験が進行中の物質を舞台として，新しいトポロジカル超伝導の出現を指摘したことで，今後のさらなる実験的研究の動機付けとなることが期待される。さらに，本研究で得られた相図や用いた解析手法を応用することで，対象とした物質固有の性質だけでなく，多様なトポロジカル物質を効率よく解析することが可能になった。現在もマヨラナ準粒子を用いた量子コンピューターの実現にむけた研究が盛んに行われているが，本研究もそのさらなる促進に寄与すると期待される。
|
