Yiling Song

Jan 24, 2024 | link.aps.org | Yang Liu |Chuang Jiang |Yiling Song |Xiaohong Li

Symmetry plays a key role in classifying topological phases, which can be enriched by the projective symmetry group in the presence of artificial gauge fields (AGFs). Here, we utilize two-dimensional (2D) photonic microring lattices to create three different topological states based on projective symmetry. By engineering link rings, we are able to flexibly manipulate the AGFs and coupling magnitude.

Apr 24, 2023 | opg.optica.org | Xiaohong Li |Peixiang Lu |Yiling Song |Shaolin Ke

AbstractThe gauge fields dramatically alter the algebraic structure of spatial symmetries and make them projectively represented, giving rise to novel topological phases. Here, we propose a photonic Möbius topological insulator enabled by projective translation symmetry in multiorbital waveguide arrays, where the artificial π gauge flux is aroused by the inter-orbital coupling between the first (s) and third (d) order modes.