2023-09-11 韓国基礎科学研究院(IBS)
◆この構造は、三層の格子で特別なスペクトル特性を持ち、ウェイル半金属などの重要な物理現象をシミュレーションできます。さらに、伝統的な実験方法では観測できないインターフェース状態を視覚化する手段を提供し、トポロジカルフォトニクスの分野に革命をもたらします。
＜関連情報＞
- https://www.ibs.re.kr/cop/bbs/BBSMSTR_000000000738/selectBoardArticle.do
- https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.053602
合成フォトニック格子におけるフェルミ円弧の再構成 Fermi Arc Reconstruction in Synthetic Photonic Lattice
D.-H.-Minh Nguyen, Chiara Devescovi, Dung Xuan Nguyen, Hai Son Nguyen, and Dario Bercioux
Physical Review Letters Published 3 August 2023
DOI:https://doi.org/10.1103/PhysRevLett.131.053602
ABSTRACT
The chiral surface states of Weyl semimetals have an open Fermi surface called a Fermi arc. At the interface between two Weyl semimetals, these Fermi arcs are predicted to hybridize and alter their connectivity. In this Letter, we numerically study a one-dimensional (1D) dielectric trilayer grating where the relative displacements between adjacent layers play the role of two synthetic momenta. The lattice emulates 3D crystals without time-reversal symmetry, including Weyl semimetal, nodal line semimetal, and Chern insulator. Besides showing the phase transition between Weyl semimetal and Chern insulator at telecom wavelength, this system allows us to observe the Fermi arc reconstruction between two Weyl semimetals, confirming the theoretical predictions.
