Helical resonant transport and purified amplification at an exceptional point

Abstract

We propose an application of a parity-time symmetric non-Hermitian Su-Schrieffer-Heeger (SSH) model by embedded it in a two-dimensional square lattice tube. The coalescence state at the exceptional point of non-Hermitian SSH model is chiral and selectively controls helical transport and amplification. Two typical helicity-dependent scattering dynamics are observed. If the incidence has an identical helicity with the embedded non-Hermitian SSH model, we observe a perfect transmission without reflection. However, if the incidence has an opposite helicity with the embedded non-Hermitian SSH model, except for a full transmission, we observe an amplified transmission with different helicity from the incidence; but the amplified reflection has identical helicity with the incidence. These intriguing features are completely unexpected in Hermitian system. Moreover, the helical amplification at high efficiency can be triggered by an arbitrary excitation. The different dynamics between incidences with opposite helicities are results of unidirectional tunneling, which is revealed to be capable of realizing without introducing magnetic field. Our findings open a direction in all-optical device and provide perspectives in non-Hermitian transport.

arXiv comment11 pages, 10 figures

References in corpus (44)

• Making Sense of Non-Hermitian Hamiltonians
• Nonreciprocal light transmission in parity-time-symmetric whispering-gallery microcavities
• Localization transitions in non-Hermitian quantum mechanics
• Coherent Perfect Absorbers: Time-reversed Lasers
• Lasing in topological edge states of a 1D lattice
• Visualization of Branch Points in PT-Symmetric Waveguides
• Anatomy of skin modes and topology in non-Hermitian systems
• Vortex Pinning and Non-Hermitian Quantum Mechanics
• PT-Symmetric Phonon Laser
• Selective enhancement of topologically induced interface states in a dielectric resonator chain
• Complex Edge-State Phase Transitions in 1D Topological Laser Arrays
• Nonreciprocal Photon Transmission and Amplification via Reservoir Engineering
• Nonreciprocal Photon Blockade
• Physical realization of $\mathcal{P}\mathcal{T}$-symmetric potential scattering in a planar slab waveguide
• Topological phase transition in non-Hermitian quasicrystals
• Topological Hybrid Silicon Microlasers
• Reciprocal skin effect and its realization in a topolectrical circuit
• Bulk-Boundary Correspondence in a Non-Hermitian System in One Dimension with Chiral-Inversion Symmetry
• The emergence, coalescence and topological properties of multiple exceptional points and their experimental realization
• Probing non-Hermitian Skin Effect and non-Bloch Phase Transitions
• Interplay of non-Hermitian skin effects and Anderson localization in non-reciprocal quasiperiodic lattices
• Robust light transport in non-Hermitian photonic lattices
• The Chirality of Exceptional Points
• Non-Reciprocal gain in non-Hermitian time-Floquet Systems
• Metal-insulator phase transition in a non-Hermitian Aubry-André-Harper Model
• Non-Hermitian transparency and one-way transport in low-dimensional lattices by an imaginary gauge field
• Observation of surface states with algebraic localization
• Incident Direction Independent Wave Propagation and Unidirectional Lasing
• Scattering in PT-symmetric quantum mechanics
• Measuring topological invariants in photonic systems
• Unidirectional Localization of Photons
• Bound states in the continuum in PT-symmetric optical lattices
• Topological photonic states in one-dimensional dimerized ultracold atomic chains
• Topological phonon polaritons in one-dimensional non-Hermitian nanoparticle chains
• Topological Phase Transition Independent of System Non-Hermiticity
• Parity-time symmetric coupled asymmetric dimers
• Non-reciprocal transmission in photonic lattices based on unidirectional coherent perfect absorption
• Half-spectral unidirectional invisibility in non-Hermitian periodic optical structures
• Reciprocal and unidirectional scattering of parity-time symmetric structures
• Asymmetric transmission through a flux-controlled non-Hermitian scattering center
• Generalized Unitarity and Reciprocity Relations for PT-symmetric Scattering Potentials
• Momentum-independent reflectionless transmission in the non-Hermitian time-reversal symmetric system
• Reciprocity and unitarity in scattering from a non-Hermitian complex PT-symmetric potential
• Non-Hermitian interferometer: Unidirectional amplification without distortion

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• Chiral current circulation and $\mathcal{P}\mathcal{T}$ symmetry in a trimer of oscillators
• Self-Shielded Topological Receiver Protectors
• Resonant generation of $p$-wave Cooper pair in non-Hermitian Kitaev chain at exceptional point
• Hidden exceptional point, localization-delocalization phase transition in Hermitian bosonic Kitaev model
• Coherent confinement and unidirectional dynamics of a wave packet induced by a non-Hermitian Su-Schrieffer-Heeger segment
• Higher order coherence as witness of exceptional point in Hermitian bosonic Kitaev dimer
• Equations of motion governing the dynamics of the exceptional points of parameterically dependent nonhermitian Hamiltonians