Nanowerk March 21, 2024
Modulation of topological phase transition has been realized in Euclidean systems. However, the spin-controlled topological phase transition in non-Euclidean space has not yet been explored. Researchers in China proposed a non-Euclidean configuration based on Möbius rings, and demonstrated the spin-controlled transition between the topological edge state and the bulk state. They utilized 8Ï€ period Möbius rings to construct both one-dimensional and two-dimensional coupled resonator optical waveguide (CROW) configurations which supported topological edge states excited by circularly polarized light of a specific handedness, while forbidding the excitation of topological modes by light of the opposite handedness. This spin-controlled topological phase transition was observed in both Hermitian and non-Hermitian cases, highlighting the robustness and versatility of the approach. The non-Hermitian case, where gain and loss are introduced into the system, adds an additional layer of complexity and richness to the topological behavior. According to the researchers the spin-dependent behavior opens new possibilities for controlling and manipulating topological states in optical systems… read more. Open Access TECHNICAL ARTICLEÂ
Graphical abstract. Credit: Frontiers in Optoelectronics, Volume 17, article number 7, (2024)