Wange Song, Zhiyuan Lin, Jitao Ji, Jiacheng Sun, Chen Chen, Shengjie Wu, Chunyu Huang, Luqi Yuan, Shining Zhu, Tao Li
Photonic structures with Weyl points (WPs), including type I and type II, promise nontrivial surface modes and intriguing light manipulations for their three-dimensional topological bands. While previous studies mainly focus on exploring WPs in a uniform Weyl structure, here we establish Weyl heterostructures (i.e., a nonuniform Weyl lattice) with different rotational orientations in the synthetic dimension by nanostructured photonic waveguides. In this work, we unveil a transition between bound and extended modes on the interface of type-II Weyl heterostructures by tuning their rotational phases, despite the reversed topological order across the interface...
April 5, 2024: Physical Review Letters