Observation of Extrinsic Topological Phases in Floquet Photonic Lattices

Author(s): Rajesh Asapanna, Rabih El Sokhen, Albert F. Adiyatullin, Clément Hainaut, Pierre Delplace, Álvaro Gómez-León, and Alberto Amo Discrete-step walks describe the dynamics of particles in a lattice subject to hopping or splitting events at discrete times. Despite being of primordial interest to the physics of quantum walks, the topological properties arising from their discrete-step nature have been hardly explored. Here we re… [Phys. Rev. Lett. 134, 256603] Published Wed Jun 25, 2025