title: Topological Optical Waveguiding in Silicon and the Transition between Topological and Trivial Defect States.
abstract: One-dimensional models with topological band structures represent a simple and versatile platform to demonstrate novel topological concepts. Here we experimentally study topologically protected states in silicon at the interface between two dimer chains with different Zak phases. Furthermore, we propose and demonstrate that, in a system where topological and trivial defect modes coexist, we can probe them independently. Tuning the configuration of the interface, we observe the transition between a single topological defect and a compound trivial defect state. These results provide a new paradigm for topologically protected waveguiding in a complementary metal-oxide-semiconductor compatible platform and highlight the novel concept of isolating topological and trivial defect modes in the same system that can have important implications in topological physics.
authors.affiliation: Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney, New South Wales 2006, Australia.
authors.forename: Andrea
authors.initials: A
authors.lastname: Blanco-Redondo
authors.affiliation: Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney, New South Wales 2006, Australia.|Departamento de Fisica Aplicada I, Escuela Tecnica Superior Ingenieria de Bilbao, Universidad del Pais Vasco (UPV/EHU), Alameda Urquijo s/n, 48013 Bilbao, Spain.
authors.forename: Imanol
authors.initials: I
authors.lastname: Andonegui
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, USA.
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Collins
authors.affiliation: Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel.
authors.forename: Gal
authors.initials: G
authors.lastname: Harari
authors.affiliation: Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel.
authors.forename: Yaakov
authors.initials: Y
authors.lastname: Lumer
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, USA.
authors.forename: Mikael C
authors.initials: MC
authors.lastname: Rechtsman
authors.affiliation: Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney, New South Wales 2006, Australia.
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Eggleton
authors.affiliation: Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel.
authors.forename: Mordechai
authors.initials: M
authors.lastname: Segev