理論検証の結果、束縛状態の制御を最適化することに意義があると研究者は述べている。 The theory-validating work has implications for optimizing control of bound states, researchers say
2022-05-19 ペンシルベニア州立大学(PennState)
研究チームは、この成果を米国物理学会の機関誌「Physical Review Letters」に発表しました。この研究は「Editors’ Suggestion」に選ばれ、APSによる解説記事にも掲載されました。
この研究は、フォノン、そして潜在的にはフォトンに相当する、いわゆるトポロジカル格子の特定の境界を散乱することなく進むことができるフォトンに関するものです。このような格子は凝縮系物質で初めて発見された。
＜関連情報＞
- https://news.engr.psu.edu/2022/jing-yun-protective-mechanism.aspx
- https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.128.174301
音響格子のディスクリネーションにおける縮退したゼロエネルギートポロジカル状態の観測 Observation of Degenerate Zero-Energy Topological States at Disclinations in an Acoustic Lattice
Yuanchen Deng, Wladimir A. Benalcazar, Ze-Guo Chen, Mourad Oudich, Guancong Ma, and Yun Jing
Physical Review Letters Published:26 April 2022
DOI:https://doi.org/10.1103/PhysRevLett.128.174301
ABSTRACT
Building upon the bulk-boundary correspondence in topological phases of matter, disclinations have recently been harnessed to trap fractionally quantized density of states (DOS) in classical wave systems. While these fractional DOS have associated states localized to the disclination’s core, such states are not protected from deconfinement due to the breaking of chiral symmetry, generally leading to resonances which, even in principle, have finite lifetimes and suboptimal confinement. Here, we devise and experimentally validate in acoustic lattices a paradigm by which topological states bind to disclinations without a fractional DOS but which preserve chiral symmetry. The preservation of chiral symmetry pins the states at the midgap, resulting in their protected maximal confinement. The integer DOS at the defect results in twofold degenerate states that, due to symmetry constraints, do not gap out. Our study provides a fresh perspective about the interplay between symmetry protection in topological phases and topological defects, with possible applications in classical and quantum systems alike.
