2020 Fiscal Year Final Research Report
Non-Hermitian topological phenomena induced by strong correlations
| Project/Area Number |
19K21032
|
|---|
| Project/Area Number (Other) |
18H05842 (2018)
|
|---|
| Research Category |
Grant-in-Aid for Research Activity Start-up
|
| Allocation Type | Multi-year Fund (2019)
Single-year Grants (2018) |
|---|
| Review Section |
0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
|
|---|
| Research Institution | University of Tsukuba |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2018-08-24 – 2021-03-31
|
| Keywords | 非エルミート系 / トポロジカル絶縁体・超伝導体 / 強相関系 |
|---|
| Outline of Final Research Achievements |
For non-Hermitian systems (e.g., open quantum systems and photonic systems with loss), a variety of novel phenomena have been reported so far. On of the typical examples is an exceptional point where the real- and imaginary-parts of energy bands touch. We have analyzed this unique topological band touching point in terms of symmetry of systems. Our studies have discovered a novel topological band touching which we term a symmetry-protected exceptional ring. In addition, we have elucidated that a topological ordered phase can emerge even in non-Hermitian systems.
|
| Free Research Field |
物性理論、強相関電子系
|
| Academic Significance and Societal Importance of the Research Achievements |
非エルミート系ではエクセプショナルポイントが発現する事は知られていたが、対称性の効果は未解明であった。本研究課題ではこの問題に取り組み、対称性に保護されたエクセプショナルリングという新しいトポロジカルバンド縮退を発見した。さらに、トポロジカル秩序相が非エルミート系でも発現する事を実証した。
これらの成果は非エルミート・トポロジカル系の基礎理論の整備に貢献するものであり学術的意義も高いと考えている。
|
