Transient non-Hermitian skin effect

Abstract

The discovery of non-Hermitian skin effect (NHSE) has opened an exciting direction for unveiling unusual physics and phenomena in non-Hermitian system. Despite notable theoretical breakthroughs, actual observation of NHSE's whole evolvement, however, relies mainly on gain medium to provide amplified mode. It typically impedes the development of simple, robust system. Here, we show that a passive system is fully capable of supporting the observation of the complete evolution picture of NHSE, without the need of any gain medium. With a simple lattice model and acoustic ring resonators, we use complex-frequency excitation to create virtual gain effect, and experimentally demonstrate that exact NHSE can persist in a totally passive system during a quasi-stationary stage. This results in the transient NHSE: passive construction of NHSE in a short time window. Despite the general energy decay, the localization character of skin modes can still be clearly witnessed and successfully exploited. Our findings unveil the importance of excitation in realizing NHSE and paves the way towards studying the peculiar features of non-Hermitian physics with diverse passive platforms.

7 pages, 4 figures

References in corpus (6)

• Topological Origin of Non-Hermitian Skin Effects
• Efficient Light Funneling based on the non-Hermitian Skin Effect
• Topological acoustics
• New topological invariants in non-Hermitian systems
• Fundamental constraints on the observability of non-Hermitian effects in passive systems
• Self-healing of non-Hermitian topological skin modes

Cited by in corpus (42)

• Anomalous Skin Effects in Disordered Systems with a Single non-Hermitian Impurity
• Dimensional transmutation from non-Hermiticity
• Non-Hermitian Floquet Topological Matter -- A Review
• Observation of dynamical degeneracy splitting for the non-Hermitian skin effect
• Synthetic non-Abelian gauge fields for non-Hermitian systems
• Exact analogue of the Hatano-Nelson model in 1D continuous nonreciprocal systems
• Observation of scale-free localized states induced by non-Hermitian defects
• Percolation-induced PT symmetry breaking
• Phase transitions and bunching of correlated particles in a non-Hermitian quasicrystal
• Emergent non-Hermitian models
• Non-Hermitian Second-Order Topological Phases and Bipolar Skin Effect in Photonic Kagome Crystals
• Hybrid scale-free skin effect in non-Hermitian systems: A transfer matrix approach
• Non-Bloch band theory of generalized eigenvalue problems
• Dynamical suppression of many-body non-Hermitian skin effect in Anyonic systems
• Algebraic non-Hermitian skin effect and generalized Fermi surface formula in arbitrary dimensions
• Gain-Loss Coupled Systems
• Pseudomagnetic suppression of non-Hermitian skin effect
• Construction of Non-Hermitian Parent Hamiltonian from Matrix Product States
• Entanglement phase transitions in non-Hermitian Floquet systems
• Higher-order Skin Effect through a Hermitian-non-Hermitian Correspondence and Its Observation in an Acoustic Kagome Lattice
• Topological $n$-root Su-Schrieffer-Heeger model in a non-Hermitian photonic ring system
• Tunable virtual gain in resonantly absorbing media
• Multiple topological transitions and spectral singularities in non-Hermitian Floquet systems
• Topologically compatible non-Hermitian skin effect
• Boundary-driven many-body phase transitions in a non-Hermitian disordered fermionic chain
• Symmetry-driven Phononic Metamaterials
• Restoration of non-Hermitian bulk-boundary correspondence by counterbalancing skin effect
• Optical pumping through the Liouvillian skin effect
• Virtual perfect absorption in resonant media and their PT-symmetric generalizations
• Non-Hermitian ultra-strong bosonic clustering through interaction-induced caging
• Optical non-Hermitian skin effect in two-dimensional uniform media
• Controllable suppression of Non-Hermitian skin effects
• Hermitian and non-Hermitian topology in active matter
• Experimentally Probing Non-Hermitian Spectral Transition and Eigenstate Skewness
• A non-Hermitian Su-Schrieffer-Heeger model with the energy levels of free parafermions
• Noisy Stark probes as quantum-enhanced sensors
• Quasiperiodic Skin Criticality in an Exactly Solvable Non-Hermitian Quasicrystal
• Exceptional horns in $n$-root graphene and Lieb photonic ring lattices
• Exceptional-point-controlled mode interaction in three-dimensional microcavities represented by generalized Husimi functions
• Reflectionless Plasma Ignition via High-Power Virtual Perfect Absorption
• Interacting many-body non-Hermitian systems as Markov chains
• Wiener-Hopf factorization and non-Hermitian topology for Amoeba formulation in one-dimensional multiband systems