Wavefront dislocations reveal the topology of quasi-1D photonic insulators
arXiv:2006.08556 · doi:10.1038/s41467-021-23790-w
Abstract
Phase singularities appear ubiquitously in wavefields, regardless of the wave equation. Such topological defects can lead to wavefront dislocations, as observed in a humongous number of classical wave experiments. Phase singularities of wave functions are also at the heart of the topological classification of the gapped phases of matter. Despite identical singular features, topological insulators and topological defects in waves remain two distinct fields. Realising 1D microwave insulators, we experimentally observe a wavefront dislocation - a 2D phase singularity - in the local density of states when the systems undergo a topological phase transition. We show theoretically that the change in the number of interference fringes at the transition reveals the topological index that characterises the band topology in the insulator.
References in corpus (28)
- Berry Phase Effects on Electronic Properties
- Topological Photonics
- Photonic Floquet Topological Insulators
- Imaging topological edge states in silicon photonics
- Topological Acoustics
- Direct Measurement of the Zak phase in Topological Bloch Bands
- Lasing in topological edge states of a 1D lattice
- Higher-Order Topology in Bismuth
- Topological mechanics of gyroscopic metamaterials
- Topological Origin of Zero-Energy Edge States in Particle-Hole Symmetric Systems
- Selective enhancement of topologically induced interface states in a dielectric resonator chain
- Complex Edge-State Phase Transitions in 1D Topological Laser Arrays
- The Zak phase and the existence of edge states in graphene
- Detection of Zak phases and topological invariants in a chiral quantum walk of twisted photons
- Two-dimensional topological superconductivity in Pb/Co/Si(111)
- Direct imaging of topological edge states in cold-atom systems
- Bulk-boundary correspondence from the inter-cellular Zak phase
- Topological characterizations of an extended Su-Schrieffer-Heeger model
- Tight-binding couplings in microwave artificial graphene
- Measuring the Berry phase of graphene from wavefront dislocations in Friedel oscillations
- Anomalous bulk-edge correspondence in continuous media
- Topological Zak Phase in Strongly-Coupled LC Circuits
- Topological phases of polaritons in a cavity waveguide
- Bragg-Berry mirrors: reflective broadband q-plates
- Friedel oscillations at the surfaces of rhombohedral -layer graphene
- Measuring topological invariants in polaritonic graphene
- Obstruction and Interference in Low Energy Models for Twisted Bilayer Graphene
- Geometrical phase shift in Friedel oscillations