Winding coupling phase for pseudo-spin-derived topological photonics.

ABSTRACT: Topological phases derived from spin or pseudo-spin typically leverage specific effects like spin-orbit interaction or antiferromagnetism. Here, we propose a flexible theoretical framework capable of designing pseudo-spin-derived topological phases. We reveal that the evanescent coupling between nearby resonators exhibits a π1(S1) topology characterized by a quantized coupling winding number. By tailoring the coupling winding number in photonic crystals, we propose silicon-on-insulator designs for the spin-valley Hall phase (SVHP), its anomalous variant, the anomalous Hall phase, and anti-helical edge states. Notably, the SVHP is obtained in a non-antiferromagnetic system without the need of time-reversal symmetry breaking, and the anti-helical edge states are designed independently of nex

SUBMITTER: Liu T 

PROVIDER: S-EPMC12830999 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature