2023 Fiscal Year Final Research Report
Topological quantum phenomena in atomic Bose-Einstein condensates
| Project/Area Number |
19H01824
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
小林 伸吾 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 (40779675)
藤本 和也 東京工業大学, 理学院, 助教 (40838059)
|
|---|
| Project Period (FY) |
2019-04-01 – 2023-03-31
|
| Keywords | 冷却原子気体 / トポロジカル構造 / トポロジカル相 / 非エルミート / ボース粒子系 |
|---|
| Outline of Final Research Achievements |
We have studied the topological structure of matter in real and momentum space and its control by a driving external field, mainly for Bose-Einstein condensates of atomic gases, but also for other quantum systems such as chiral magnets and superconductor/normal conductor junction systems. As major results, we have investigated the properties of non-Hermitian Hamiltonians intrinsic to Bose particle systems, and clarified the topology of the appearance of complex eigenvalues and how the appearance of complex eigenvalues can be controlled by a driving external field. We also proposed an experimental method to realize nontrivial topological classes under the time-periodic Hamiltonian. Furthermore, we elucidated the dynamics of vortex generation by artificial gauge fields created by the spatial structure of spins.
|
| Free Research Field |
物性理論
|
| Academic Significance and Societal Importance of the Research Achievements |
ボース対称性に由来した非エルミート系において、複素固有値を含む場合のトポロジカル数を定義したこと、および複素固有値の出現機構を明らかにしたことで、微視的に明確な起源をもつ非エルミート性の性質が明らかになった。フロケ・トポロジカル相のクラスを制御する方法を提案したことで、相変化、クラスの変化を実験的に制御しながら研究する道が開けた。スピンテクスチャにより人工ゲージ場を作ることで、新たな渦生成ダイナミクスが明らかになった。
|
