Simultaneous Observation of Topological Edge State and Exceptional Point in an Open and Non-Hermitian System

Abstract

This paper reports on the experimental observation of topologically protected edge state and exceptional point in an open and Non-Hermitian system. While the theoretical underpinning is generic to wave physics, the simulations and experiments are performed for an acoustic system whose structure has non-trivial topological properties that can be characterized by the Chern number provided that a synthetic dimension is introduced. Unidirectional reectionless propagation, a hallmark of exceptional point, is unambiguously observed in both simulations and experiments.

References in corpus (30)

• Topological Insulators
• Topological insulators and superconductors
• Possible Realization of Directional Optical Waveguides in Photonic Crystals with Broken Time-Reversal Symmetry
• Nonreciprocal light transmission in parity-time-symmetric whispering-gallery microcavities
• Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
• Unidirectional Invisibility induced by PT-Symmetric Periodic Structures
• Imaging topological edge states in silicon photonics
• Scheme to Achieve Silicon Topological Photonics
• Reflection-Free One-Way Edge Modes in a Gyromagnetic Photonic Crystal
• PT-Symmetric Quantum Mechanics
• Acoustic topological insulator and robust one-way sound transport
• Topological States and Adiabatic Pumping in Quasicrystals
• Coherent Perfect Absorbers: Time-reversed Lasers
• Observation of topological valley transport of sound in sonic crystals
• Spawning rings of exceptional points out of Dirac cones
• Probing topological invariants in the bulk of a non-Hermitian optical system
• Observation of Bulk Fermi Arc and Polarization Half Charge from Paired Exceptional Points
• Selective enhancement of topologically induced interface states in a dielectric resonator chain
• Topologically protected acoustic helical edge states and interface states in strongly coupled metamaterial ring lattices
• The emergence, coalescence and topological properties of multiple exceptional points and their experimental realization
• Edge states and topological phases in one-dimensional optical superlattices
• Topological Equivalence between the Fibonacci Quasicrystal and the Harper Model
• Observation of an exceptional point in a chaotic optical microcavity
• Unusual Resonators: Plasmonics, Metamaterials, and Random Media
• Coexistence of quantized and non-quantized geometric phases in quasi-one-dimensional systems without inversion symmetry
• Zone folding induced topological insulators in phononic crystals
• PT-symmetric scattering in flow duct acoustics
• Radiative topological states in resonant photonic crystals
• Phase spectroscopy of topological invariants in photonic crystals
• Unidirectional zero reflection as gauged parity-time symmetry

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• Exceptional Topology of Non-Hermitian Systems
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• Observation of non-Hermitian bulk-boundary correspondence in quantum dynamics
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• Bulk-Boundary Correspondence in a Non-Hermitian System in One Dimension with Chiral-Inversion Symmetry
• New topological invariants in non-Hermitian systems
• Non-Bloch topological invariants in a non-Hermitian domain-wall system
• Extremely asymmetrical acoustic metasurface mirror at the exceptional point
• Breaking Anti-$\mathcal{P}\mathcal{T}$ Symmetry by Spinning a Resonator
• Non-Hermitian Floquet topological phases with arbitrarily many real-quasienergy edge states
• Floquet Topological Phases of Non-Hermitian Systems
• Non-Hermitian Floquet topological phases: Exceptional points, coalescent edge modes, and the skin effect
• Topology of anti-parity-time-symmetric non-Hermitian Su-Schrieffer-Heeger model
• Topological quantum walks in momentum space with a Bose-Einstein condensate
• Hybrid skin-topological modes without asymmetric couplings
• Inner Skin Effects on Non-Hermitian Topological Fractals
• Engineering tunable local loss in a synthetic lattice of momentum states
• Magic-angle Bilayer Phononic Graphene
• Four-Dimensional Higher-Order Chern Insulator and Its Acoustic Realization
• Topological band theory for non-Hermitian systems from the Dirac equation
• Non-Hermitian Floquet topological superconductors with multiple Majorana edge modes
• Dynamical characterization of non-Hermitian Floquet topological phases in one-dimension
• Floquet second-order topological insulators in non-Hermitian systems
• Symmetry protected topological phases characterized by isolated exceptional points
• Dimerization induced mobility edges and multiple reentrant localization transitions in non-Hermitian quasicrystals
• Universal competitive spectral scaling from the critical non-Hermitian skin effect
• Non-Hermitian topological phases and dynamical quantum phase transitions: A generic connection
• Electric circuit simulations of $n$th-Chern insulators in $2n$-dimensional space and their non-Hermitian generalizations for arbitral $n$
• Spinful topological phases in acoustic crystals with projective PT symmetry
• Finite temperature dynamical quantum phase transition in a non-Hermitian system
• Non-Hermitian Squeezed Polarons
• Non-Hermitian dislocation modes: Stability and melting across exceptional points
• Topological origin of quantized transport in non-Hermitian Floquet chains
• Inversion symmetric non-Hermitian Chern insulator
• Topological energy braiding of the non-Bloch bands
• Entanglement Spectrum Crossings Reveal non-Hermitian Dynamical Topology
• Boundary Condition Independence of Non-Hermitian Hamiltonian Dynamics
• Anomaly in dynamical quantum phase transition in non-Hermitian system with extended gapless phases
• Emergent $\mathcal{P}\mathcal{T}$ symmetry in a double-quantum-dot circuit QED set-up
• Non-Hermitian pseudo mobility edge in a coupled chain system
• Space-Time Phononic Crystals with Anomalous Topological Edge States
• $\eta$-pairing ground states in the non-Hermitian Hubbard model
• Acoustic Multifunctional Logic Gates and Amplifier based on Passive Parity-Time Symmetry
• Non-Hermitian Weyl semimetal and its Floquet engineering
• Topological delocalization transitions and mobility edges in the nonreciprocal Maryland model
• Exceptional Cones in 4D Parameter Space
• Non-Hermitian Floquet phases with even-integer topological invariants in a periodically quenched two-leg ladder
• Modified Generalized-Brillouin-Zone Theory with On-site Disorders
• Nonlinear Non-Hermitian Landau-Zener-Stückelberg-Majorana interferometry
• Filling up complex spectral regions through non-Hermitian disordered chains
• Emergence of tunable exceptional points in altermagnet-ferromagnet junctions
• Universal characteristics of one-dimensional non-Hermitian superconductors
• Quantum entanglement and non-Hermiticity in free-fermion systems
• Quantum walks of correlated photons in non-Hermitian photonic lattices
• Correlation-induced phase transitions and mobility edges in an interacting non-Hermitian quasicrystal
• Selective and tunable excitation of topological non-Hermitian skin modes
• Two Classes of Singularities and Novel Topology in a Specially Designed Synthetic Photonic Crystals
• Non-Hermitian three-dimensional two-band Hopf insulator
• Persistent anomaly in dynamical quantum phase transition in long-range non-Hermitian $p$-wave Kitaev chain
• Switching between topological edge states in plasmonic systems using phase-change materials
• Multitude of exceptional points in van der Waals magnets
• Topological characterization of a non-Hermitian ladder via Floquet non-Bloch theory
• Visualizing Topology of Real-Energy Gapless Phase Arising from Exceptional Point
• General theory for infernal points in non-Hermitian systems
• Exotic Topology in Ordinary Soft Matter
• Néel vector controlled exceptional contours in $p$-wave magnet-ferromagnet junctions
• Model non-Hermitian topological operators without skin effect: A general principle of construction
• Counterdiabatic driving for pseudo- and antipseudo- Hermitian systems
• Hermitian and non-Hermitian topology in active matter
• Observation of dislocation-induced topological modes in a three-dimensional acoustic topological insulator
• Unified Bulk-Entanglement Correspondence in Non-Hermitian Systems
• Multitype entanglement dynamics induced by exceptional points
• Controlling asymmetric absorption of metasurfaces via non-Hermitian doping
• Non-Hermitian higher-order topological insulators enabled by altermagnet engineering
• Probing phase transitions in non-Hermitian systems with quantum entanglement
• Nonreciprocity Induced Fractional Nonlinear Thouless Pumping
• Gain-loss-engineering: a new platform for extreme anisotropic thermal photon tunneling
• Experimental Realization of Acoustic Bianisotropic Gratings
• Hexagonal Warping Control of Exceptional Points in Topological Insulator--Ferromagnetic Heterojunctions