Seeing Topological Order and Band Inversion in Optical Diatomic Chain

Abstract

Recent realizations of exotic topological states in condensed matter and cold atoms have advanced the exploration for topological characteristics, such as invariant topological orders and band inversion. Here we construct a 1D optical diatomic system made of split ring resonators with electric-magnetic couplings to implement the topological features. We experimentally measure the dispersion relationship and sub-lattice pseudo-spin vectors by detecting field strength distributions, which determines the accompanying winding number of bulk band as the topological order. The sub-lattice pseudo-spin vector inversion observed at band-edges evidences the band inversion. We further reconfirm the band-inversion-induced topological phase transition by measuring the symmetry exchanges at band-edges. These results have shown the great potential of split ring resonator platform to experimentally explore the advanced topological characteristics, such as high winding numbers or even high Chern numbers in more exotic setups.

arXiv comment7 pages, 5figures

References in corpus (20)

• Topological insulators and superconductors
• Non-Abelian Anyons and Topological Quantum Computation
• Photonic Floquet Topological Insulators
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Experimental realisation of the topological Haldane model
• Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
• Dissipationless Quantum Spin Current at Room Temperature
• Imaging topological edge states in silicon photonics
• Robust optical delay lines via topological protection
• Direct Measurement of the Zak phase in Topological Bloch Bands
• Probing topological invariants in the bulk of a non-Hermitian optical system
• Selective enhancement of topologically induced interface states in a dielectric resonator chain
• Surface Impedance and Bulk Band Geometric Phases in One-Dimensional Systems
• Topologically protected defect states in open photonic systems with non-hermitian charge-conjugation and parity-time symmetry
• Seeing topological order in time-of-flight measurements
• Measurement of topological invariants in a 2D photonic system
• Direct Probe of Topological Invariants Using Bloch Oscillating Quantum Walks
• Chern numbers hiding in time-of-flight images
• Measuring topology in a laser-coupled honeycomb lattice: From Chern insulators to topological semi-metals
• Experimental demonstration of the robust end state in a split-ring-resonator chain